Clinical Approach to Chest Pain

Comprehensive Practical Framework

1
Symptom Overview
Overview
2
Pathophysiology
Mechanism
3
History Taking
History
4
Physical Examination
Examination
5
Differential Diagnosis
Differential
6
Investigations
Workup
7
Clinical Decision-Making
Algorithm
8
Pearls and Pitfalls
Summary

1. Symptom Overview

Understanding the clinical significance and classification of chest pain

Chest pain is one of the most common and clinically significant presenting complaints in medicine. It accounts for approximately 6 to 8 million emergency department visits annually in the United States alone, representing roughly 5% of all emergency visits. In primary care settings, chest pain constitutes approximately 1 to 2% of all office visits. While the majority of cases are due to benign conditions, chest pain carries immense clinical weight because it may herald life-threatening emergencies including acute coronary syndrome, pulmonary embolism, and aortic dissection. The clinician’s challenge lies in rapidly identifying the minority of patients with dangerous etiologies while avoiding unnecessary testing in those with benign causes.

Definition

Chest pain refers to any discomfort or abnormal sensation perceived in the thoracic region, from the clavicles superiorly to the diaphragm inferiorly, and between the axillary lines laterally. It may originate from cardiac, pulmonary, gastrointestinal, musculoskeletal, or neuropsychiatric structures, and the character and location of pain often provide important diagnostic clues but cannot reliably exclude serious pathology.

Key Epidemiological Statistics

Emergency department: Approximately 5 to 10% of chest pain presentations are due to acute coronary syndrome
Primary care: Musculoskeletal causes account for 30 to 50% of chest pain presentations
Gastrointestinal causes: Responsible for approximately 10 to 20% of cases
Psychogenic causes: Account for up to 10% of presentations, particularly in younger patients
Pulmonary embolism: Found in approximately 2 to 5% of emergency chest pain evaluations

Classification by Duration

Category	Duration	Common Causes	Clinical Significance
Acute	Less than 24 hours	Acute coronary syndrome, pulmonary embolism, pneumothorax, aortic dissection, musculoskeletal strain	Highest priority for urgent evaluation; must rule out life-threatening causes immediately
Subacute	1 to 4 weeks	Pericarditis, pleuritis, costochondritis, herpes zoster, pneumonia	Inflammatory and infectious causes more likely; still requires thorough evaluation
Chronic	Greater than 4 weeks	Stable angina, gastroesophageal reflux disease, musculoskeletal syndromes, anxiety disorders	Lower immediate risk but requires systematic workup to identify underlying cause and prevent progression

Classification by Character

Visceral (Cardiac-Type) Pain

Description: Dull, heavy, pressure-like, squeezing, or tightness sensation. Often described as “an elephant sitting on my chest” or “a tight band around my chest.”

Clinical implications: Suggests cardiac ischemia, esophageal disorders, or other visceral organ involvement. Poorly localized due to convergence of visceral afferents. May be associated with autonomic symptoms such as diaphoresis and nausea.

Somatic (Pleuritic/Musculoskeletal) Pain

Description: Sharp, stabbing, well-localized pain that worsens with movement, deep breathing, or palpation.

Clinical implications: Suggests pleural, pericardial, or chest wall origin. The ability to precisely localize the pain and reproduce it with palpation or movement favors musculoskeletal etiology, though pleuritic pain from pulmonary embolism or pneumonia must still be considered.

Burning Pain

Description: Burning or warm sensation, often retrosternal, may be associated with acid taste or regurgitation.

Clinical implications: Strongly suggests gastroesophageal reflux disease or esophagitis. However, burning chest pain can also occur with acute coronary syndrome, particularly inferior myocardial infarction, making this descriptor unreliable for excluding cardiac causes.

Tearing or Ripping Pain

Description: Sudden, severe, tearing sensation often radiating to the back, described as the “worst pain of my life.”

Clinical implications: Classic description for aortic dissection. Requires immediate investigation with computed tomography angiography. The migration of pain as dissection propagates is a characteristic feature.

Classification by Pattern and Timing

Pattern	Description	Suggests
Exertional	Occurs during physical activity, relieved by rest within minutes	Stable angina pectoris, demand ischemia
Rest pain	Occurs without provocation, including at rest or during sleep	Unstable angina, acute coronary syndrome, vasospastic angina
Postprandial	Occurs after meals, particularly large or fatty meals	Gastroesophageal reflux disease, biliary colic, mesenteric ischemia
Positional	Worse when lying flat, improved sitting forward	Pericarditis, gastroesophageal reflux disease
Pleuritic	Sharp pain worsened by inspiration or coughing	Pleuritis, pulmonary embolism, pneumonia, pericarditis, pneumothorax
Reproducible with palpation	Pain reproduced by pressing on the chest wall	Costochondritis, musculoskeletal strain (but does not exclude cardiac cause)
Nocturnal	Occurs predominantly at night, may wake patient from sleep	Gastroesophageal reflux disease, vasospastic angina, unstable angina

Classification by Radiation Pattern

Radiation Pattern	Description	Suggests
Left arm or shoulder	Pain radiating down the left arm, particularly ulnar distribution	Cardiac ischemia (referred pain via shared spinal segments C8-T4)
Jaw or neck	Pain radiating to the jaw, teeth, or neck	Cardiac ischemia, particularly in women and elderly patients
Interscapular (between shoulder blades)	Severe pain radiating to the back between the scapulae	Aortic dissection (classic), posterior myocardial infarction
Right shoulder	Pain referred to the right shoulder or scapula	Biliary disease, hepatic pathology (phrenic nerve irritation)
Epigastric	Pain felt predominantly in the upper abdomen	Inferior myocardial infarction, gastroesophageal reflux disease, peptic ulcer disease

Key Concept: The “Killer Five” Must-Not-Miss Diagnoses

Every patient presenting with chest pain must be evaluated for these five life-threatening conditions before considering benign diagnoses:

Acute coronary syndrome — myocardial infarction or unstable angina
Pulmonary embolism — venous thromboembolism to the pulmonary vasculature
Aortic dissection — tear in the aortic intima with propagation
Tension pneumothorax — air accumulation causing mediastinal shift
Esophageal rupture (Boerhaave syndrome) — full-thickness esophageal perforation

Clinical Pearl: Atypical Presentations

Women, elderly patients, and those with diabetes mellitus frequently present with atypical symptoms of acute coronary syndrome. These may include isolated dyspnea, fatigue, nausea, diaphoresis, or pain in atypical locations (jaw, back, epigastric region) without classic substernal chest pressure. Maintain a high index of suspicion in these populations, as reliance on “typical” presentations will miss a significant proportion of acute coronary syndrome cases.

2. Pathophysiology and Mechanisms

Understanding the underlying mechanisms of chest pain

Understanding the mechanisms of chest pain is essential for clinical reasoning and appropriate management. The thorax contains structures from multiple organ systems—cardiovascular, pulmonary, gastrointestinal, and musculoskeletal—each with distinct innervation patterns that produce characteristic pain qualities and distributions. The key to understanding chest pain lies in recognizing that visceral and somatic structures transmit pain through different pathways, resulting in fundamentally different pain experiences that can guide differential diagnosis.

Neural Pathways of Thoracic Pain

Component	Structure	Function
Visceral Afferents	Sympathetic fibers traveling with cardiac, esophageal, and mediastinal nerves; enter spinal cord at T1-T5	Transmit poorly localized, deep, aching pain from heart, great vessels, and esophagus; responsible for referred pain patterns
Somatic Afferents	Intercostal nerves (T1-T12), phrenic nerve (C3-C5)	Transmit well-localized, sharp pain from chest wall, parietal pleura, and parietal pericardium
Spinal Cord Processing	Dorsal horn neurons at T1-T5 segments	Convergence of visceral and somatic afferents explains referred pain phenomena; cardiac pain referred to arm, jaw, and epigastrium
Central Processing	Spinothalamic tract to thalamus and cortex	Conscious perception of pain location, quality, and intensity; modulated by emotional and cognitive factors

Pain Classification by Innervation Type

Visceral Pain

Origin: Heart, esophagus, great vessels, visceral pleura, visceral pericardium

Characteristics: Diffuse, poorly localized, deep, pressure-like or squeezing quality

Clinical relevance: Cardiac ischemia produces visceral pain that is classically difficult to localize precisely; patients often use a clenched fist over the sternum (Levine sign) rather than pointing with one finger

Somatic Pain

Origin: Chest wall (muscles, ribs, cartilage), parietal pleura, parietal pericardium, skin

Characteristics: Sharp, well-localized, often reproducible with palpation or movement

Clinical relevance: Pleuritic chest pain (sharp, worse with breathing) indicates involvement of parietal pleura or pericardium; musculoskeletal pain is typically reproducible with palpation

Referred Pain

Origin: Convergence of visceral afferents with somatic afferents at same spinal cord levels

Characteristics: Pain perceived in somatic distribution (arm, jaw, neck) despite visceral organ pathology

Clinical relevance: Cardiac ischemia commonly refers to left arm (T1-T2), jaw (trigeminocardiac reflex), and epigastrium (shared T5 innervation); understanding referral patterns prevents misdiagnosis

How Specific Conditions Cause Chest Pain

Condition	Mechanism	Treatment Implication
Acute coronary syndrome (myocardial ischemia)	Myocardial oxygen demand exceeds supply; adenosine and lactate accumulation stimulates cardiac afferent C-fibers; coronary artery occlusion causes transmural ischemia with intense visceral pain	Restore oxygen supply (reperfusion) and reduce demand (beta-blockers, nitrates); aspirin inhibits platelet aggregation at plaque rupture site
Stable angina pectoris	Fixed coronary stenosis limits blood flow during increased demand (exertion); subendocardial ischemia triggers reversible visceral pain; resolves when demand decreases	Nitrates increase coronary blood flow and reduce preload; beta-blockers reduce myocardial oxygen demand; long-term management with risk factor modification
Aortic dissection	Intimal tear allows blood to track through media, separating aortic wall layers; stretching of adventitial pain fibers causes severe, tearing visceral pain; dissection propagation causes migrating pain	Immediate blood pressure and heart rate control to limit propagation; surgical or endovascular repair depending on location (Stanford classification)
Pulmonary embolism	Embolus lodges in pulmonary artery, causing V/Q mismatch and hypoxemia; pulmonary infarction irritates visceral then parietal pleura causing pleuritic pain; release of inflammatory mediators	Anticoagulation prevents clot propagation; thrombolysis or embolectomy for massive pulmonary embolism with hemodynamic instability
Pericarditis	Inflammation of pericardium; visceral pericardium is insensate but parietal pericardium is innervated by phrenic and intercostal nerves; friction between inflamed surfaces causes sharp, positional pain	Anti-inflammatory therapy (NSAIDs, colchicine) reduces inflammation; sitting forward reduces pericardial friction and pain
Pneumothorax	Air in pleural space separates visceral and parietal pleura; parietal pleural irritation causes sharp, ipsilateral pleuritic pain; tension pneumothorax causes mediastinal shift and cardiovascular collapse	Small pneumothorax may be observed; larger requires chest tube drainage; tension pneumothorax requires immediate needle decompression
Gastroesophageal reflux disease	Reflux of gastric acid into esophagus stimulates esophageal chemoreceptors and nociceptors; visceral esophageal pain mimics cardiac pain due to shared spinal cord segments (T1-T5)	Proton pump inhibitors reduce gastric acid production; lifestyle modifications reduce reflux episodes; response to acid suppression supports diagnosis
Esophageal spasm	Uncoordinated or sustained esophageal smooth muscle contractions; stimulates esophageal visceral afferents; pain can be severe and identical to anginal pain; may respond to nitrates (confounding diagnosis)	Smooth muscle relaxants (calcium channel blockers, nitrates) relieve spasm; important to exclude cardiac disease first as both respond to nitrates
Costochondritis	Inflammation of costochondral or costosternal joints; somatic pain from intercostal nerve irritation; reproduced with palpation of affected joints	NSAIDs and local measures; reassurance that condition is benign; exclusion of cardiac disease provides patient comfort
Herpes zoster (shingles)	Reactivation of varicella-zoster virus in dorsal root ganglion; causes dermatomal pain and vesicular eruption; neuropathic pain may precede rash by days, causing diagnostic confusion	Antiviral therapy (acyclovir, valacyclovir) reduces duration and severity if started early; pain management for acute and post-herpetic neuralgia
Panic disorder	Autonomic hyperactivation causes chest tightness, palpitations, and dyspnea; hyperventilation causes hypocapnia and paresthesias; heightened interoceptive awareness amplifies normal sensations	Cognitive behavioral therapy addresses catastrophic misinterpretation; reassurance after excluding organic disease; SSRIs for prevention of recurrent attacks

Viscero-Somatic Convergence and Referred Pain

Why Cardiac Pain Refers to the Arm and Jaw:

The phenomenon of referred cardiac pain is explained by the convergence-projection theory. Visceral afferents from the heart enter the spinal cord at levels T1-T5, where they synapse on the same second-order neurons that receive input from somatic structures (skin, muscles) of the arm (T1-T2) and chest wall. Because the brain rarely receives input from visceral structures but commonly from somatic structures, it interprets the signal as coming from the somatic distribution—hence pain is “referred” to the arm, shoulder, or jaw.

Left arm pain: T1-T2 dermatomes overlap with cardiac visceral afferents
Jaw pain: Trigeminocardiac reflex; connections between trigeminal nucleus and cardiac afferents in the brainstem
Epigastric pain: Inferior cardiac surface shares T5 innervation with upper abdominal viscera

Complications of Severe or Prolonged Chest Pain

Physiological Complications

Sympathetic activation: Tachycardia, hypertension, increased myocardial oxygen demand (can worsen ischemia)
Splinting and hypoventilation: Shallow breathing due to pleuritic pain leads to atelectasis and hypoxemia
Vagal response: Bradycardia, hypotension, nausea in severe pain (Bezold-Jarisch reflex with inferior myocardial infarction)

Psychological Complications

Anxiety and fear: Chest pain generates significant psychological distress, particularly fear of heart attack
Hypervigilance: Heightened attention to bodily sensations can perpetuate functional chest pain syndromes
Activity avoidance: Fear of triggering pain leads to deconditioning and reduced quality of life

Often Overlooked Mechanism: Esophageal-Cardiac Reflex

The esophagus and heart share common vagal innervation and adjacent spinal cord segments. This creates two clinically important phenomena: (1) esophageal distension or acid exposure can trigger reflex coronary vasoconstriction, potentially causing true cardiac ischemia in patients with underlying coronary artery disease, and (2) esophageal pain can be indistinguishable from cardiac pain and may even respond to nitroglycerin (which relaxes esophageal smooth muscle as well as coronary arteries). This overlap means that relief of chest pain with nitroglycerin or antacids does not reliably distinguish cardiac from esophageal etiologies.

Pathophysiology of Coronary Ischemia: A Detailed Look

Given that acute coronary syndrome is the most dangerous cause of chest pain, understanding its pathophysiology is essential for all clinicians.

Phase	Pathophysiological Process	Clinical Correlation
Stable Plaque	Atherosclerotic plaque with thick fibrous cap; gradual luminal narrowing over years; stenosis must exceed 70% before flow becomes limiting during exertion	Stable angina; predictable symptoms with exertion; relieved by rest; positive stress test at reproducible workload
Plaque Rupture	Thin-capped fibroatheroma ruptures, exposing thrombogenic lipid core to blood; platelet adhesion and aggregation begin immediately	Transition from stable to unstable symptoms; new or changing pattern of chest pain; represents the moment of acute coronary syndrome onset
Thrombus Formation	Platelet plug forms rapidly; coagulation cascade activated; partial or complete coronary occlusion develops within minutes to hours	Unstable angina (partial occlusion) or STEMI (complete occlusion); ECG changes evolve; troponin rises if myocyte necrosis occurs
Myocardial Ischemia	Oxygen delivery falls below metabolic demand; switch from aerobic to anaerobic metabolism; ATP depletion, lactate accumulation, adenosine release	Chest pain onset; ECG ST-segment changes (depression in subendocardial ischemia, elevation in transmural ischemia)
Myocardial Infarction	Prolonged ischemia (more than 20 minutes) causes irreversible myocyte death beginning in subendocardium and progressing transmurally (“wavefront of necrosis”)	Rising troponin levels; persistent symptoms; door-to-balloon time critical to limit infarct size; larger infarct correlates with worse prognosis

Key Teaching Point: Time Is Muscle

Myocardial cell death progresses as a “wavefront” from endocardium to epicardium over approximately 4 to 6 hours of complete coronary occlusion. Every 30-minute delay in reperfusion results in measurable additional myocardial loss. This is why the door-to-balloon time target for primary percutaneous coronary intervention is less than 90 minutes, and why prehospital ECG transmission and cath lab activation have become standard of care.

3. History Taking

A comprehensive approach to eliciting the chest pain history

Red Flags — Require Urgent Evaluation

Sudden, severe “worst pain of my life” — Aortic dissection, pulmonary embolism
Pain radiating to back (interscapular) — Aortic dissection
Associated syncope or near-syncope — Arrhythmia, massive pulmonary embolism, aortic dissection
Hypotension or signs of shock — Cardiogenic shock, tension pneumothorax, massive pulmonary embolism
New neurological deficits with chest pain — Aortic dissection with carotid involvement

Severe dyspnea or respiratory distress — Pulmonary embolism, tension pneumothorax, acute heart failure
Unilateral leg swelling with chest pain — Deep vein thrombosis with pulmonary embolism
Pain following forceful vomiting — Esophageal rupture (Boerhaave syndrome)
Chest pain with hemodynamic instability — Any of the “Killer Five” diagnoses
Known coronary artery disease with new or changing symptoms — Unstable angina, acute myocardial infarction

Systematic History: The “CHEST PAIN” Approach

Use the mnemonic “CHEST PAIN” to ensure comprehensive history taking for thoracic symptoms:

C — Character: What does the pain feel like? (pressure, sharp, burning, tearing)
H — History and risk factors: Cardiac risk factors, prior similar episodes, known diagnoses
E — Exacerbating and relieving factors: What makes it worse or better? (exertion, rest, position, breathing, eating)
S — Severity and onset: How severe on a scale of 1-10? Sudden versus gradual onset?
T — Timing and duration: When did it start? How long does it last? Constant or intermittent?
P — Provocation: What were you doing when it started? Any precipitating events?
A — Associated symptoms: Dyspnea, diaphoresis, nausea, palpitations, syncope, cough?
I — Impact and radiation: Where does it radiate? How does it affect your activities?
N — Nitroglycerin and medication response: Have you taken anything for it? Did it help?

Targeted Questions by Suspected Cause

Suspected Cause	Key Features	Ask This Question
Acute coronary syndrome	Substernal pressure, radiation to arm or jaw, diaphoresis, dyspnea	“Does the pain feel like pressure or squeezing? Does it spread to your arm, neck, or jaw? Did you break out in a cold sweat?”
Stable angina pectoris	Predictable exertional symptoms, relieved by rest	“Does the pain come on with physical activity and go away when you rest? Is it always at the same level of exertion?”
Aortic dissection	Sudden severe tearing pain, radiation to back, pulse deficits	“Did the pain start suddenly at its worst, like something ripping or tearing? Does it go straight through to your back?”
Pulmonary embolism	Pleuritic pain, dyspnea, risk factors (immobility, malignancy, surgery)	“Is the pain sharp and worse when you take a deep breath? Have you had recent surgery, travel, or been less mobile than usual? Any leg swelling or pain?”
Pneumothorax	Sudden pleuritic pain, dyspnea, often young thin males or COPD	“Did the pain come on suddenly? Are you having trouble breathing? Have you had a collapsed lung before?”
Pericarditis	Sharp pain worse lying flat, better leaning forward, recent viral illness	“Is the pain worse when you lie down and better when you sit up and lean forward? Have you had a cold or flu recently?”
Gastroesophageal reflux disease	Burning, postprandial, nocturnal, associated with acid taste	“Is the pain burning in nature? Does it come on after eating or when lying down? Do you get an acid or sour taste in your mouth?”
Esophageal spasm	Severe squeezing retrosternal pain, often with swallowing	“Does the pain come on when you swallow? Does it feel like food is getting stuck? Does it come with eating or drinking cold liquids?”
Costochondritis	Localized tenderness at costochondral junctions, reproducible	“Can you point with one finger to exactly where it hurts? Does pressing on that spot reproduce the pain? Does it hurt more when you move or twist?”
Herpes zoster (shingles)	Dermatomal pain, may precede rash, burning or shooting quality	“Is the pain in a band-like pattern on one side? Does it burn or shoot? Have you noticed any rash or blisters in that area?”
Panic disorder	Episodic, associated with fear, palpitations, paresthesias, hyperventilation	“When the pain comes on, do you feel a sense of impending doom or intense fear? Do you get tingling in your hands or around your mouth? Do you feel like you’re going to die?”
Pneumonia	Pleuritic pain, fever, cough, sputum production	“Do you have a cough? Are you bringing up any phlegm? Have you had fever or chills?”

Cardiovascular Risk Factor Assessment

Essential Risk Factors to Document

Cardiovascular risk factors significantly influence the pre-test probability of acute coronary syndrome:

Major Risk Factors:

Age (men ≥45 years, women ≥55 years)
Hypertension
Diabetes mellitus
Dyslipidemia (elevated LDL, low HDL)
Cigarette smoking (current or recent)
Family history of premature coronary artery disease (first-degree relative: men <55, women <65)

Additional Factors:

Obesity (BMI ≥30)
Sedentary lifestyle
Chronic kidney disease
Known peripheral arterial disease
Prior stroke or transient ischemic attack
Cocaine or amphetamine use

Venous Thromboembolism Risk Assessment

Risk Factor Category	Specific Factors to Ask About	Clinical Relevance
Immobility	Recent long travel (>4 hours), hospitalization, bed rest, leg cast or immobilization	Stasis is a major component of Virchow’s triad; prolonged immobility significantly increases pulmonary embolism risk
Surgery or trauma	Recent surgery (especially orthopedic, pelvic, abdominal), major trauma, fractures	Endothelial injury and immobility; highest risk in first 2-4 weeks postoperatively
Malignancy	Active cancer, recent chemotherapy, known metastatic disease	Cancer creates hypercoagulable state; pulmonary embolism may be presenting sign of occult malignancy
Hormonal factors	Oral contraceptives, hormone replacement therapy, pregnancy, postpartum period	Estrogen increases clotting factor production; pregnancy increases risk 5-fold
Prior venous thromboembolism	History of deep vein thrombosis or pulmonary embolism, known thrombophilia	Prior venous thromboembolism is strongest predictor of recurrence; inquire about family history for inherited thrombophilias

Medication and Substance History

Medications That May Cause or Contribute to Chest Pain

Bisphosphonates (oral) — Esophagitis, esophageal ulceration
Potassium chloride supplements — Esophageal irritation and ulceration
NSAIDs — Peptic ulcer disease, gastritis
Tetracyclines (doxycycline) — Pill esophagitis if taken without adequate water
Iron supplements — Gastric irritation, esophagitis
Corticosteroids — Peptic ulcer disease
5-Fluorouracil and other chemotherapy — Coronary vasospasm, cardiotoxicity

Substances and Social History

Cocaine: Potent coronary vasoconstrictor; can cause acute myocardial infarction even in young patients with normal coronary arteries; inquire about recent use
Amphetamines and methamphetamine: Sympathomimetic effects cause coronary vasospasm and demand ischemia
Cannabis: Associated with acute coronary syndrome, particularly when smoked; carbon monoxide exposure
Tobacco smoking: Accelerates atherosclerosis; inquire about pack-years
Alcohol: Heavy use associated with cardiomyopathy, arrhythmias (“holiday heart”)
Energy drinks: High caffeine content can precipitate arrhythmias and chest discomfort

Treatment Response as Diagnostic Information

Treatment	If Pain Relieved	Diagnostic Reliability
Sublingual nitroglycerin	Suggests angina, but also relieves esophageal spasm	LOW — Cannot distinguish cardiac from esophageal causes; both respond to nitrates
Antacids or proton pump inhibitors	Suggests gastroesophageal reflux disease	MODERATE — Relief supports but does not confirm diagnosis; placebo effect possible
NSAIDs	Suggests musculoskeletal or inflammatory cause (pericarditis, costochondritis)	MODERATE — Pain relief supports diagnosis but is not specific
“GI cocktail” (antacid + viscous lidocaine)	Suggests gastrointestinal source	LOW — Studies show poor specificity; relief does not exclude cardiac disease

Critical Warning: Treatment Response Is Unreliable

Relief of chest pain with nitroglycerin, antacids, or a “GI cocktail” does NOT reliably exclude acute coronary syndrome. Multiple studies have shown that patients with confirmed myocardial infarction may experience relief with these treatments, and patients with benign causes may not respond. Treatment response should never be used as the sole criterion to rule out life-threatening diagnoses.

Occupational and Environmental Considerations

Occupational Exposures

Asbestos exposure: Pleural disease, mesothelioma
Silica, coal dust: Pneumoconiosis, lung disease
Carbon monoxide: Can cause chest pain mimicking angina
Heavy physical labor: Musculoskeletal strain
High-stress occupations: May contribute to panic attacks, stress cardiomyopathy

Environmental and Travel History

Recent air travel: Venous thromboembolism risk (flights >4 hours)
High altitude exposure: Can unmask coronary insufficiency
Recent viral illness: Pericarditis, myocarditis
Endemic areas for fungal infections: Histoplasmosis, coccidioidomycosis can cause pleuritic pain

4. Physical Examination

A systematic head-to-toe approach for chest pain

Systematic Framework: Use the “General → Vital Signs → Head-to-Toe → Focused Systems” approach for complete examination of patients presenting with chest pain. Remember that the physical examination serves two purposes: (1) identifying findings that support a specific diagnosis, and (2) assessing hemodynamic stability and severity.

General Inspection

Appearance: Comfortable versus distressed; diaphoretic (suggests acute coronary syndrome, pulmonary embolism); clutching chest (Levine sign suggests cardiac ischemia); writhing (suggests visceral pain such as biliary colic or renal colic rather than cardiac)
Respiratory effort: Tachypnea, use of accessory muscles, tripod positioning, inability to speak in full sentences
Color: Pallor (anemia, shock), cyanosis (hypoxemia, shock), mottling (poor perfusion)
Mental status: Anxiety, confusion (hypoxemia or hypoperfusion), or calm and reassured
Body habitus: Tall, thin (Marfan syndrome, increased pneumothorax risk); obesity (increased cardiovascular risk)

Vital Signs — Critical First Step

Vital Sign	What to Look For	Clinical Significance
Blood Pressure	Hypotension (<90/60 mmHg); hypertension (>180/120 mmHg); blood pressure differential between arms (>20 mmHg systolic)	Hypotension suggests cardiogenic shock, massive pulmonary embolism, tension pneumothorax, or tamponade; arm-to-arm differential suggests aortic dissection; severe hypertension with chest pain requires rapid evaluation for dissection
Heart Rate	Tachycardia (>100 bpm); bradycardia (<60 bpm); irregular rhythm	Tachycardia with chest pain suggests pulmonary embolism, anxiety, or compensatory response to hypotension; bradycardia may indicate inferior myocardial infarction with vagal activation or heart block; irregular rhythm suggests atrial fibrillation
Respiratory Rate	Tachypnea (>20/min); bradypnea	Tachypnea is a sensitive (though nonspecific) finding in pulmonary embolism; may indicate pain, anxiety, hypoxemia, or metabolic acidosis
Oxygen Saturation	Hypoxemia (<94% on room air); desaturation with minimal exertion	Hypoxemia suggests pulmonary pathology (pulmonary embolism, pneumonia, pneumothorax) or cardiogenic pulmonary edema; normal saturation does not exclude pulmonary embolism
Temperature	Fever (>38.0°C); hypothermia	Fever suggests infectious or inflammatory cause (pneumonia, pericarditis, empyema); absence does not exclude infection, especially in elderly or immunocompromised

Critical Action: Blood Pressure in Both Arms

In any patient with chest pain and suspected aortic dissection, measure blood pressure in BOTH arms. A systolic difference greater than 20 mmHg suggests aortic arch involvement and has high specificity for dissection. This simple maneuver takes seconds and can be lifesaving.

Head and Neck Examination

Jugular Venous Pressure

Elevated JVP: Right heart failure, pulmonary embolism, cardiac tamponade, tension pneumothorax
Kussmaul sign (JVP rises with inspiration): Constrictive pericarditis, restrictive cardiomyopathy, right ventricular infarction
Prominent ‘a’ waves: Tricuspid stenosis, pulmonary hypertension
Cannon ‘a’ waves: Complete heart block, ventricular tachycardia

Other Head and Neck Findings

Tracheal deviation: Tension pneumothorax (deviates AWAY from affected side); massive pleural effusion
Carotid bruits: Atherosclerotic disease (marker of systemic atherosclerosis)
Carotid pulse asymmetry: Aortic dissection with arch involvement
Thyroid enlargement: Thyrotoxicosis can cause chest pain, palpitations
Lymphadenopathy: Malignancy, infection

Cardiovascular Examination

Inspection and Palpation

Apex beat: Displaced laterally (cardiomegaly, left ventricular dilation); hyperdynamic (volume overload); sustained/heaving (pressure overload)
Right ventricular heave: Parasternal lift indicates right ventricular hypertrophy or dilation (pulmonary hypertension, pulmonary embolism)
Thrills: Palpable murmurs suggest significant valvular disease

Auscultation

Finding	Description	Associated Conditions
S3 gallop	Low-pitched sound in early diastole; heard at apex with bell	Left ventricular systolic dysfunction, heart failure, acute myocardial infarction with reduced ejection fraction
S4 gallop	Low-pitched sound in late diastole (presystolic); heard at apex with bell	Decreased ventricular compliance (hypertension, ischemia, hypertrophic cardiomyopathy); common in acute myocardial infarction
Pericardial friction rub	Scratchy, superficial, three-component sound (atrial systole, ventricular systole, early diastole); best heard at left sternal border with patient leaning forward	Acute pericarditis; may be transient or position-dependent
New systolic murmur	Murmur not previously documented	Acute mitral regurgitation (papillary muscle rupture in myocardial infarction); ventricular septal defect (post-infarction); aortic stenosis unmasked by reduced cardiac output
Aortic regurgitation murmur	Early diastolic decrescendo murmur at right sternal border; may be soft	Aortic dissection involving aortic valve; endocarditis
Muffled heart sounds	Distant, quiet heart sounds	Pericardial effusion or tamponade (with elevated JVP and hypotension = Beck’s triad); obesity; COPD with hyperinflation
Loud P2	Accentuated pulmonic component of S2	Pulmonary hypertension, pulmonary embolism

Respiratory Examination

Inspection

Chest wall asymmetry: Hyperexpansion on one side suggests pneumothorax or large effusion
Subcutaneous emphysema: Crepitus on palpation indicates pneumomediastinum or pneumothorax with air tracking
Accessory muscle use: Indicates significant respiratory distress

Percussion

Hyperresonance: Pneumothorax (unilateral)
Dullness: Pleural effusion, consolidation, hemothorax

Auscultation

Finding	Description	Associated Conditions
Absent breath sounds (unilateral)	No air movement heard on affected side	Pneumothorax, large pleural effusion, mainstem bronchus obstruction
Crackles (rales)	Fine inspiratory crackles, often bibasilar	Pulmonary edema (cardiogenic or non-cardiogenic), pneumonia, interstitial lung disease
Wheezes	High-pitched expiratory sounds	Asthma, COPD, cardiac asthma (left heart failure)
Pleural friction rub	Grating sound synchronous with respiration; localized	Pleuritis (pulmonary embolism with infarction, pneumonia, malignancy)
Bronchial breath sounds	Loud, tubular breath sounds in peripheral lung fields	Consolidation (pneumonia), atelectasis with patent airway

Chest Wall Examination

Finding	Technique	Clinical Significance
Reproducible tenderness	Palpate costochondral junctions (2nd-5th), sternoclavicular joints, and intercostal muscles; apply pressure to reproduce pain	Suggests costochondritis or musculoskeletal cause; HOWEVER, reproducible tenderness does NOT exclude cardiac disease (up to 15% of myocardial infarction patients have chest wall tenderness)
Swelling at costochondral junction	Visible or palpable swelling, typically at 2nd-3rd costochondral junction	Tietze syndrome (distinguished from costochondritis by swelling)
Dermatomal vesicular rash	Inspect entire chest wall; rash may be subtle or early	Herpes zoster; pain may precede rash by 2-4 days
Ecchymosis or deformity	Inspect for bruising, asymmetry, crepitus	Rib fracture, chest wall trauma

Abdominal Examination

Epigastric tenderness: Peptic ulcer disease, gastritis, pancreatitis; also referred pain from inferior myocardial infarction
Right upper quadrant tenderness: Biliary disease (cholecystitis can cause referred chest pain via phrenic nerve)
Murphy’s sign: Inspiratory arrest with right upper quadrant palpation suggests acute cholecystitis
Hepatomegaly with pulsatility: Tricuspid regurgitation, right heart failure
Hepatojugular reflux: Sustained JVP elevation with abdominal pressure indicates elevated right heart pressures
Abdominal aortic aneurysm: Palpate for pulsatile mass; important if considering aortic pathology

Extremity Examination

Upper Extremities

Pulse asymmetry: Reduced or absent radial pulse suggests aortic dissection
Blood pressure differential: >20 mmHg systolic difference between arms
Peripheral cyanosis: Suggests poor perfusion
Marfanoid features: Arachnodactyly, arm span > height (increased dissection risk)

Lower Extremities

Unilateral leg swelling: Deep vein thrombosis; measure calf circumference (>3 cm difference is significant)
Calf tenderness, warmth, erythema: Deep vein thrombosis
Homan’s sign: Calf pain with dorsiflexion; low sensitivity and specificity, not recommended
Bilateral pedal edema: Right heart failure, bilateral deep vein thrombosis
Peripheral pulses: Absent or reduced femoral pulses suggest aortic dissection or peripheral arterial disease

Digital Clubbing

Presence of clubbing: Loss of normal nail bed angle (>180°), increased nail bed fluctuation
Significance: Chronic hypoxemia (lung cancer, interstitial lung disease, cyanotic heart disease, bronchiectasis); NOT present in acute conditions

Expected Examination Findings by Etiology

Condition	General/Vital Signs	Cardiovascular	Other Key Findings
Acute coronary syndrome	Diaphoresis, pallor; may be hypo- or hypertensive; tachycardia or bradycardia	S4 gallop common; S3 if acute heart failure; new murmur if complication	Often normal examination; Levine sign; may have pulmonary crackles if heart failure
Aortic dissection	Severe distress; hypertension (often severe) or hypotension (if tamponade/rupture)	Aortic regurgitation murmur; pulse deficits; blood pressure differential between arms	Neurological deficits if carotid involvement; muffled heart sounds if tamponade
Pulmonary embolism	Tachycardia, tachypnea; hypoxemia; may be normotensive or hypotensive	Loud P2; right ventricular heave; elevated JVP; tricuspid regurgitation	Unilateral leg swelling; pleural rub; examination often normal in submassive PE
Tension pneumothorax	Severe respiratory distress; hypotension; tachycardia	Elevated JVP; tracheal deviation away from affected side	Absent breath sounds on affected side; hyperresonance; subcutaneous emphysema
Cardiac tamponade	Hypotension; tachycardia; pulsus paradoxus (>10 mmHg drop in systolic BP with inspiration)	Elevated JVP; muffled heart sounds (Beck’s triad); Kussmaul sign may be present	Clear lung fields (distinguishes from heart failure)
Pericarditis	Low-grade fever may be present; often otherwise normal vitals	Pericardial friction rub (pathognomonic but may be intermittent)	Pain worse supine, better sitting forward; examination often normal
Pneumonia	Fever; tachypnea; tachycardia; hypoxemia	Usually normal	Crackles, bronchial breath sounds, dullness to percussion over consolidation
Gastroesophageal reflux disease	Normal vital signs	Normal	May have epigastric tenderness; examination typically normal
Costochondritis	Normal vital signs	Normal	Reproducible tenderness at costochondral junctions; no swelling
Panic disorder	Tachycardia; tachypnea; normal oxygen saturation	Normal (may have sinus tachycardia)	Patient appears anxious; may have tremor; hyperventilation; normal examination between episodes

Important Teaching Point

Normal examination is COMMON in serious conditions! Many life-threatening causes of chest pain—including acute coronary syndrome, pulmonary embolism, and early aortic dissection—may present with completely normal physical examination findings. A normal examination should NEVER be used to rule out dangerous diagnoses. The primary value of the physical examination is to identify findings that increase the probability of specific diagnoses and to assess hemodynamic stability, not to exclude serious pathology.

Physical Examination Pearls

The “Levine sign”: Patient placing clenched fist over sternum to describe pain suggests cardiac ischemia
The “pointing sign”: Ability to localize pain with one finger suggests chest wall origin (but does not exclude cardiac disease)
Pulsus paradoxus: If suspected tamponade, measure blood pressure during inspiration and expiration; drop >10 mmHg is abnormal
Listen for friction rubs twice: Pericardial and pleural rubs can be transient; re-examine with position changes
Don’t forget the back: Examine for costovertebral angle tenderness (pulmonary embolism with infarction, pneumonia) and thoracic spine tenderness

5. Differential Diagnosis

Systematic approach organized by probability and clinical features

The differential diagnosis of chest pain is broad, encompassing conditions from immediately life-threatening emergencies to benign self-limited disorders. The key to effective clinical reasoning is organizing the differential by probability while maintaining vigilance for dangerous diagnoses regardless of their frequency. Remember: common things are common, but rare things that kill must never be missed.

The “Killer Five” — Must Rule Out First

Before considering benign diagnoses, systematically exclude these five life-threatening conditions:

Acute coronary syndrome — ECG + troponin
Pulmonary embolism — Risk stratification + D-dimer or CT angiography
Aortic dissection — CT angiography

Tension pneumothorax — Clinical diagnosis + chest X-ray
Esophageal rupture — CT with oral contrast or esophagram

Acute Chest Pain (Less than 24 hours)

Probability	Condition	Key Features	Red Flags
COMMON (approximately 60-70%)	Musculoskeletal pain (costochondritis, muscle strain)	Sharp, localized, reproducible with palpation or movement; history of physical activity or trauma	Does NOT reliably exclude cardiac disease; 15% of myocardial infarction patients have reproducible chest wall tenderness
	Gastroesophageal reflux disease	Burning, retrosternal, worse postprandially or supine, associated with acid taste	May mimic and coexist with cardiac disease; response to antacids does not exclude acute coronary syndrome
	Anxiety and panic disorder	Episodic, associated with fear, palpitations, dyspnea, paresthesias; situational triggers	Diagnosis of exclusion; must rule out organic causes first, especially in patients with risk factors
	Acute bronchitis or upper respiratory infection	Associated with cough, viral prodrome; chest discomfort from coughing	Fever with pleuritic pain should prompt evaluation for pneumonia
LESS COMMON (approximately 20-30%)	Acute coronary syndrome (unstable angina, NSTEMI, STEMI)	Pressure, squeezing, radiation to arm or jaw, diaphoresis, dyspnea; risk factors present	Atypical presentations common in women, elderly, diabetics; may present as dyspnea, fatigue, or epigastric pain alone
	Pneumonia	Pleuritic pain, fever, cough productive of purulent sputum, dyspnea	Hypoxemia, high fever, rigors, elderly or immunocompromised patient
	Pericarditis	Sharp, pleuritic, positional (worse supine, better leaning forward); recent viral illness	Associated with fever and large effusion; must exclude myocarditis and tamponade
	Pneumothorax (simple)	Sudden pleuritic pain, dyspnea; tall thin males, smokers, known lung disease	Progression to tension pneumothorax with hemodynamic instability
UNCOMMON BUT SERIOUS (approximately 5-10%)	Pulmonary embolism	Pleuritic pain, dyspnea, tachycardia; risk factors (immobility, malignancy, hormones, prior venous thromboembolism)	Syncope, hypotension, severe hypoxemia suggest massive pulmonary embolism
	Aortic dissection	Sudden severe tearing pain radiating to back; hypertension; connective tissue disease	Pulse deficits, blood pressure differential, neurological symptoms, aortic regurgitation murmur
	Tension pneumothorax	Severe dyspnea, hypotension, tracheal deviation, absent breath sounds	Clinical diagnosis — do NOT delay treatment for imaging
	Cardiac tamponade	Dyspnea, hypotension, elevated jugular venous pressure, muffled heart sounds	Pulsus paradoxus >10 mmHg; may follow pericarditis, malignancy, trauma, or procedure
	Esophageal rupture (Boerhaave syndrome)	Severe retrosternal pain after forceful vomiting; subcutaneous emphysema; Mackler triad	Mediastinal air on imaging; high mortality if diagnosis delayed

Chronic Chest Pain (Greater than 4 weeks)

Step-by-Step Approach to Chronic Chest Pain:

Step 1: Assess for stable coronary artery disease — stress testing if intermediate pretest probability
Step 2: Evaluate for the “Big Three” of chronic chest pain — gastroesophageal reflux disease, musculoskeletal causes, and stable angina
Step 3: Consider less common causes if initial evaluation is unrevealing
Step 4: Recognize functional chest pain syndromes after thorough exclusion of organic disease

Probability	Condition	Approximate Frequency	Key Distinguishing Features
COMMON	Gastroesophageal reflux disease	10-20%	Burning, postprandial, nocturnal; responds to proton pump inhibitors; may have esophagitis on endoscopy
	Musculoskeletal syndromes	30-50%	Reproducible tenderness, related to movement; costochondritis, fibromyalgia, myofascial pain
	Stable angina pectoris	10-15%	Predictable exertional symptoms, relieved by rest; positive stress test; coronary artery disease on angiography
LESS COMMON	Esophageal motility disorders	5-10%	Dysphagia, chest pain with swallowing; diagnosed by esophageal manometry
	Peptic ulcer disease	5%	Epigastric or lower chest pain, relationship to meals, Helicobacter pylori infection, NSAID use
	Biliary disease	3-5%	Right upper quadrant or epigastric pain radiating to right shoulder; postprandial, especially fatty meals
	Chronic anxiety or panic disorder	5-10%	Episodic symptoms with anxiety, situational triggers; diagnosis of exclusion
UNCOMMON	Vasospastic (Prinzmetal) angina	1-2%	Rest angina, often nocturnal; transient ST elevation during episodes; responds to calcium channel blockers
	Microvascular angina (cardiac syndrome X)	1-3%	Anginal symptoms with normal coronary arteries; more common in women; abnormal coronary flow reserve
	Hypertrophic cardiomyopathy	<1%	Exertional chest pain, dyspnea, syncope; family history of sudden death; systolic murmur that increases with Valsalva
	Thoracic malignancy	Variable	Persistent pain, weight loss, smoking history; may cause chest wall invasion, pleural effusion, or Pancoast syndrome

Anatomical Approach to Chest Pain

Cardiovascular

Acute coronary syndrome

Stable angina pectoris

Aortic dissection

Pericarditis

Myocarditis

Aortic stenosis

Hypertrophic cardiomyopathy

Takotsubo cardiomyopathy

Pulmonary

Pulmonary embolism

Pneumonia

Pneumothorax

Pleuritis

Pulmonary hypertension

Lung malignancy

Tracheobronchitis

Gastrointestinal

Gastroesophageal reflux disease

Esophageal spasm

Esophagitis (pill, infectious)

Esophageal rupture

Peptic ulcer disease

Biliary colic and cholecystitis

Pancreatitis

Musculoskeletal and Other

Costochondritis

Rib fracture

Muscle strain

Herpes zoster

Thoracic radiculopathy

Fibromyalgia

Panic disorder

Functional chest pain

Drug-Induced Chest Pain

Drug or Drug Class	Mechanism	Characteristics	Management
Cocaine	Coronary vasoconstriction, increased myocardial oxygen demand, accelerated atherosclerosis, prothrombotic effects	Can cause acute myocardial infarction in young patients with normal coronary arteries; onset within hours of use	Avoid beta-blockers (unopposed alpha effect); benzodiazepines, nitroglycerin, aspirin; consider catheterization
Amphetamines and methamphetamine	Sympathomimetic effects, coronary vasospasm, demand ischemia	Similar to cocaine; may also cause cardiomyopathy with chronic use	Supportive care; benzodiazepines for agitation; avoid beta-blockers
5-Fluorouracil and capecitabine	Coronary vasospasm; direct endothelial toxicity	Chest pain during infusion or within days; may cause acute coronary syndrome	Discontinue drug; calcium channel blockers and nitrates may help; rechallenge rarely attempted
Triptans (sumatriptan and others)	Coronary vasoconstriction (5-HT1B receptor agonism)	Chest tightness, pressure; usually benign but contraindicated in coronary artery disease	Usually self-limited; avoid in patients with known or suspected coronary artery disease
Bisphosphonates (oral alendronate, risedronate)	Direct esophageal mucosal irritation and ulceration	Retrosternal burning, odynophagia; occurs if taken without adequate water or lying down afterward	Discontinue or switch to IV formulation; proton pump inhibitor; proper administration technique
NSAIDs	Gastric and esophageal mucosal damage; cardiovascular risk (COX-2 inhibitors)	Epigastric or retrosternal burning from gastritis or ulcer; increased cardiovascular events with prolonged use	Discontinue; proton pump inhibitor for gastrointestinal symptoms
Potassium chloride (oral supplements)	Direct esophageal mucosal injury	Retrosternal pain, odynophagia; more common with wax-matrix formulations	Discontinue; switch to liquid formulation or microencapsulated form
Doxycycline and other tetracyclines	Pill esophagitis from prolonged esophageal contact	Severe retrosternal pain, odynophagia; occurs when taken without adequate water or at bedtime	Take with full glass of water; remain upright for 30 minutes; switch to alternative antibiotic if severe
Ergot alkaloids (ergotamine)	Coronary and peripheral vasoconstriction	Anginal chest pain; contraindicated in coronary artery disease	Discontinue; vasodilators if needed; avoid in patients with vascular disease
Thyroid hormone (excessive replacement)	Increased myocardial oxygen demand; can precipitate angina in patients with coronary artery disease	Palpitations, chest discomfort, anxiety; suppressed TSH	Reduce dose; beta-blockers for symptom control

Quick Reference: “If You See This, Think This”

Clinical Clue	Think This First	Next Step
Substernal pressure with exertion, relieved by rest	Stable angina pectoris	Stress testing; optimize medical therapy
New or accelerating chest pain at rest	Acute coronary syndrome	ECG within 10 minutes; serial troponins; aspirin
Sudden severe tearing pain radiating to back	Aortic dissection	Bilateral blood pressures; urgent CT angiography; blood pressure control
Pleuritic pain with dyspnea and leg swelling	Pulmonary embolism with deep vein thrombosis	Wells score; D-dimer or CT pulmonary angiography; anticoagulation
Sharp pain worse lying flat, better leaning forward	Pericarditis	ECG (diffuse ST elevation, PR depression); echocardiogram; NSAIDs plus colchicine
Sudden pleuritic pain in tall, thin young male	Primary spontaneous pneumothorax	Chest X-ray; observation versus aspiration versus chest tube based on size
Burning retrosternal pain worse after meals	Gastroesophageal reflux disease	Empiric proton pump inhibitor trial; endoscopy if alarm features or refractory
Reproducible tenderness at costochondral junction	Costochondritis	NSAIDs; reassurance; but do not use to exclude cardiac disease if risk factors present
Dermatomal pain with vesicular rash	Herpes zoster	Antiviral therapy within 72 hours of rash onset; pain management
Chest pain following forceful vomiting	Esophageal rupture (Boerhaave syndrome)	CT chest with oral contrast; surgical consultation; broad-spectrum antibiotics
Chest pain with cocaine use	Cocaine-induced acute coronary syndrome	ECG, troponin; benzodiazepines; avoid beta-blockers; cardiology consultation
Episodic chest pain with palpitations and paresthesias	Panic attack	Rule out organic causes first; then supportive care; consider psychiatric referral

Age-Based Differential Considerations

Young Adults (18-40 years)

Musculoskeletal causes (most common)
Anxiety and panic disorder
Pericarditis and myocarditis
Pneumothorax (especially tall, thin males)
Cocaine-induced chest pain
Pulmonary embolism (if risk factors)
Acute coronary syndrome (rare but possible, especially with cocaine, family history, or familial hyperlipidemia)

Older Adults (>65 years)

Acute coronary syndrome (higher prevalence)
Atypical presentations more common
Aortic dissection and aneurysm
Malignancy (lung, esophageal)
Herpes zoster
Pulmonary embolism
Aortic stenosis
Multiple concurrent diagnoses common

6. Diagnostic Investigations

A stepwise, cost-effective approach guided by clinical suspicion

The diagnostic approach to chest pain should be guided by clinical probability assessment, aiming to efficiently identify life-threatening conditions while avoiding unnecessary testing in low-risk patients. The key principle is risk stratification: use clinical features to estimate pretest probability, then select investigations that will meaningfully change post-test probability and clinical management.

Immediate Investigations for All Patients with Acute Chest Pain

Investigation	Purpose	What to Look For	Practical Points
12-Lead ECG	Identify acute coronary syndrome, arrhythmia, pericarditis	ST elevation or depression; T-wave inversions; new Q waves; diffuse ST elevation with PR depression (pericarditis); S1Q3T3 pattern (pulmonary embolism); new bundle branch block	Obtain within 10 minutes of presentation; repeat if symptoms change; compare to prior ECG if available; a normal ECG does NOT exclude acute coronary syndrome
Chest X-ray	Identify pneumothorax, pneumonia, pulmonary edema, widened mediastinum	Pneumothorax (visceral pleural line); infiltrates; cardiomegaly; widened mediastinum (dissection); pleural effusion; rib fractures	Portable acceptable in unstable patients; upright PA preferred if possible; widened mediastinum has low sensitivity for dissection
Cardiac troponin (high-sensitivity preferred)	Detect myocardial injury	Elevated troponin with rise and/or fall pattern indicates myocardial infarction; single elevated value without dynamic change may indicate chronic elevation	High-sensitivity troponin detectable earlier (1-3 hours); serial measurements at 0 and 3 hours (or 0, 1, and 3 hours); many causes of elevated troponin besides acute coronary syndrome
Basic metabolic panel	Assess renal function, electrolytes	Creatinine (contrast decisions, medication dosing); potassium (arrhythmia risk); bicarbonate (metabolic acidosis in shock)	Baseline for contrast administration; identify electrolyte abnormalities that may contribute to arrhythmias
Complete blood count	Identify anemia, infection, thrombocytopenia	Anemia (may exacerbate ischemia); leukocytosis (infection, stress); thrombocytopenia (bleeding risk with anticoagulation)	Anemia can cause demand ischemia; leukocytosis nonspecific but supports infection or inflammation

Interpreting Troponin Results

High-sensitivity troponin interpretation:

Very low (below limit of detection): High negative predictive value for myocardial infarction; consider early discharge protocols if low clinical risk
Low but detectable: Repeat in 1-3 hours; look for rise (delta change)
Elevated with rise and/or fall: Diagnostic for acute myocardial injury; if clinical context supports, diagnose myocardial infarction
Elevated but stable: Consider chronic elevation (renal failure, heart failure, structural heart disease)

Causes of elevated troponin other than acute coronary syndrome: Pulmonary embolism, myocarditis, heart failure, sepsis, renal failure, takotsubo cardiomyopathy, cardioversion, cardiac contusion

Targeted Investigations by Suspected Etiology

If Suspecting Acute Coronary Syndrome

First-Line Tests

Serial ECGs: Repeat every 15-30 minutes if ongoing symptoms; dynamic changes increase specificity
Serial high-sensitivity troponins: At 0 and 3 hours minimum; 0, 1, 3 hours with rapid rule-out protocols
Echocardiography: Wall motion abnormalities support ischemia; assess left ventricular function; identify complications

Second-Line and Definitive Tests

Coronary angiography: Gold standard for coronary anatomy; indicated for STEMI (primary PCI), high-risk NSTEMI, or positive stress test
CT coronary angiography: Rule out coronary artery disease in low-to-intermediate risk patients; high negative predictive value
Stress testing: For stable patients with intermediate risk; exercise or pharmacological with ECG, echo, or nuclear imaging

If Suspecting Pulmonary Embolism

Risk Stratification First

Wells Score for Pulmonary Embolism: Calculate to estimate pretest probability (low, moderate, high)
PERC Rule: If low clinical suspicion AND all 8 PERC criteria negative, pulmonary embolism effectively ruled out without further testing
Age-adjusted D-dimer: For patients over 50, cutoff = age × 10 μg/L (e.g., 600 μg/L for 60-year-old)

Confirmatory Testing

D-dimer: High sensitivity, low specificity; useful to rule out if clinical probability is not high; age-adjusted thresholds improve specificity
CT pulmonary angiography: Test of choice for diagnosis; shows clot location and burden; also identifies alternative diagnoses
V/Q scan: Alternative if CT contraindicated (contrast allergy, renal failure, pregnancy); requires normal chest X-ray for best interpretation
Lower extremity Doppler ultrasound: If positive for deep vein thrombosis, confirms venous thromboembolism; useful if CT contraindicated

If Suspecting Aortic Dissection

Initial Assessment

ADD-RS (Aortic Dissection Detection Risk Score): Assess risk features in three categories (conditions, pain features, examination findings); guides testing approach
D-dimer: If ADD-RS low (0-1), negative D-dimer has high negative predictive value; not useful if high clinical suspicion
Chest X-ray: Widened mediastinum in ~60% but absence does NOT exclude dissection

Definitive Imaging

CT angiography of aorta: Test of choice; sensitivity and specificity >95%; shows intimal flap, true and false lumens, extent of dissection
Transesophageal echocardiography: Alternative if CT not available or patient too unstable to transport; can be done at bedside; excellent for ascending aorta
MR angiography: Excellent accuracy but usually not practical in acute setting

If Suspecting Pericarditis

First-Line Tests

ECG: Diffuse ST elevation with PR depression (stage 1); concave up (“smiley face”) morphology; may see diffuse T-wave inversions later
Inflammatory markers: Elevated ESR, CRP support diagnosis; CRP useful for monitoring treatment response
Troponin: May be mildly elevated in myopericarditis; high elevations suggest significant myocardial involvement

Additional Investigations

Echocardiography: Assess for pericardial effusion and tamponade physiology; normal echo does not exclude pericarditis
Cardiac MRI: Shows pericardial inflammation and edema; useful for recurrent or complicated cases
CT chest: Pericardial thickening, effusion; useful if other diagnoses also being considered

If Suspecting Gastrointestinal Causes

First-Line Approach

Empiric proton pump inhibitor trial: 2-4 weeks of twice-daily proton pump inhibitor; response supports gastroesophageal reflux disease diagnosis (but does not exclude cardiac disease)
Basic labs: Lipase if pancreatitis suspected; liver function tests and bilirubin if biliary disease
Abdominal ultrasound: For right upper quadrant pain; assess gallbladder, biliary tree

Second-Line Tests

Upper endoscopy (EGD): If alarm features (dysphagia, weight loss, GI bleeding), refractory symptoms, or age >60 with new symptoms
Esophageal manometry: For suspected motility disorders; dysphagia with normal endoscopy
24-hour pH monitoring: Quantify acid exposure; useful if proton pump inhibitor trial inconclusive
CT chest/abdomen with oral contrast: If esophageal rupture suspected (Boerhaave syndrome)

Clinical Decision Tools and Risk Scores

Condition	Risk Score	Components	Clinical Application
Acute Coronary Syndrome	HEART Score	History, ECG, Age, Risk factors, Troponin (0-10 points)	Score 0-3: Low risk, consider early discharge; Score 4-6: Moderate, observation and testing; Score ≥7: High risk, admission and intervention
Acute Coronary Syndrome	TIMI Risk Score (for UA/NSTEMI)	Age ≥65, ≥3 CAD risk factors, known CAD, aspirin use, recent angina, ST changes, elevated troponin (0-7 points)	Higher scores predict increased risk of death, MI, or need for revascularization; guides intensity of therapy
Pulmonary Embolism	Wells Score (PE)	Clinical signs of DVT, PE most likely diagnosis, HR >100, immobilization/surgery, previous VTE, hemoptysis, malignancy	Low probability: D-dimer to rule out; Moderate: D-dimer or CT; High probability: Proceed directly to CT angiography
Pulmonary Embolism	PERC Rule	Age <50, HR <100, O2 sat ≥95%, no hemoptysis, no estrogen, no surgery/trauma, no prior VTE, no unilateral leg swelling	If ALL 8 criteria met AND low clinical suspicion, PE effectively ruled out without D-dimer or imaging
Pulmonary Embolism Prognosis	PESI / sPESI	Age, male sex, cancer, heart failure, chronic lung disease, HR ≥110, SBP <100, O2 <90%, and others	Stratifies mortality risk; low-risk patients may be candidates for outpatient treatment
Aortic Dissection	ADD-RS (Aortic Dissection Detection Risk Score)	High-risk conditions (Marfan, family history), high-risk pain features (abrupt, severe, tearing), high-risk exam findings (pulse deficit, BP differential, new murmur)	Score 0-1 with negative D-dimer: Low risk; Score ≥2 or high clinical suspicion: Proceed to CT angiography

Empiric Treatment Trials as Diagnostic Tools

Sequential Empiric Therapy for Unexplained Chronic Chest Pain

When cardiac causes have been excluded and diagnosis remains unclear, empiric treatment trials can serve as both diagnostic and therapeutic interventions. Response to therapy supports the diagnosis but is not definitive.

Proton pump inhibitor trial: High-dose proton pump inhibitor (e.g., omeprazole 40 mg twice daily) for 2-4 weeks — tests for gastroesophageal reflux disease
NSAID trial: Ibuprofen or naproxen for 1-2 weeks — tests for musculoskeletal or inflammatory causes
Calcium channel blocker or nitrate trial: For suspected esophageal dysmotility or vasospastic angina — tests for smooth muscle spasm
Tricyclic antidepressant: Low-dose amitriptyline or nortriptyline — tests for functional chest pain or visceral hypersensitivity

Investigation Pitfalls to Avoid

Single troponin to rule out: A single troponin at presentation may be falsely negative if measured too early; serial measurements are required
Normal ECG excludes acute coronary syndrome: Up to 6% of patients with acute myocardial infarction have a normal initial ECG
Chest X-ray rules out aortic dissection: Mediastinal widening is present in only ~60% of dissections; CT angiography is required if clinical suspicion
D-dimer alone rules out pulmonary embolism: D-dimer is only useful in low-to-moderate probability patients; high clinical probability requires imaging regardless
Response to nitroglycerin confirms cardiac origin: Both cardiac and esophageal pain may respond to nitroglycerin; this does not differentiate the two
Negative stress test excludes coronary disease: Stress tests have imperfect sensitivity (~85%); negative result reduces but does not eliminate possibility of coronary artery disease

Cost-Effective Investigation Strategy

Principle: Match testing intensity to clinical risk. Avoid both undertesting (missing dangerous diagnoses) and overtesting (unnecessary cost, radiation, false positives).

Low-risk patients: History, physical examination, ECG, and possibly troponin may be sufficient; consider early discharge pathways
Intermediate-risk patients: Require further testing (serial troponins, stress testing, or CT coronary angiography)
High-risk patients: Require admission, monitoring, and often invasive evaluation

Remember: The goal is not to order every test but to select the tests that will most efficiently and accurately change clinical management.

7. Pattern Recognition and Clinical Decision-Making

Practical algorithms and decision pathways

Effective clinical decision-making in chest pain requires rapid integration of history, examination, and initial investigations to guide appropriate triage and management. The primary goal is to identify patients with life-threatening conditions who require immediate intervention while efficiently evaluating and safely discharging those with benign causes.

Step 1: Is This Urgent? — Initial Triage

Clinical Scenario	Urgency Level	Immediate Action
STEMI on ECG (ST elevation in contiguous leads)	EMERGENT	Activate cardiac catheterization lab; aspirin, anticoagulation, P2Y12 inhibitor; door-to-balloon target <90 minutes
Hypotension with chest pain (systolic BP <90 mmHg)	EMERGENT	IV access, cardiac monitor, supplemental oxygen; consider cardiogenic shock, massive PE, tension pneumothorax, tamponade, aortic dissection
Sudden severe tearing pain radiating to back	EMERGENT	Bilateral blood pressures; urgent CT angiography; IV beta-blocker for heart rate and blood pressure control; surgical consultation
Severe respiratory distress with absent breath sounds	EMERGENT	If tension pneumothorax suspected with hemodynamic instability: immediate needle decompression followed by chest tube; do NOT delay for imaging
Beck’s triad (hypotension, elevated JVP, muffled heart sounds)	EMERGENT	Pericardiocentesis for tamponade; bedside echocardiography; IV fluids as temporizing measure
NSTEMI or unstable angina (dynamic ECG changes, elevated troponin)	URGENT	Admission to monitored bed; dual antiplatelet therapy; anticoagulation; cardiology consultation; early invasive strategy for high-risk features
Suspected pulmonary embolism with hemodynamic stability	URGENT	Risk stratify (Wells score); D-dimer if appropriate; CT pulmonary angiography; initiate anticoagulation if high suspicion while awaiting imaging
Acute pericarditis with moderate effusion	URGENT	Echocardiography to assess effusion size and hemodynamics; NSAIDs plus colchicine; admission if large effusion or hemodynamic concern
Low-risk chest pain, normal ECG, negative initial troponin	ROUTINE	Serial troponins; apply HEART score or similar risk stratification; consider early discharge pathways if very low risk
Classic musculoskeletal features, young patient, no risk factors	ROUTINE	ECG to document; consider troponin if any atypical features; NSAIDs and reassurance if clearly musculoskeletal

Step 2: Classify by Presentation Type

Acute Onset (<24 hours)

Priority: Rule out “Killer Five”

Proceed to Algorithm A

Subacute (Days to Weeks)

Priority: Inflammatory, infectious, or progressive cardiac causes

Proceed to Algorithm B

Chronic (>4 Weeks)

Priority: Stable CAD, GERD, musculoskeletal, functional

Proceed to Algorithm C

Step 3: Follow the Appropriate Algorithm

Algorithm A: Acute Chest Pain (<24 hours)

Clinical Scenario	Most Likely Diagnosis	Action
ST elevation on ECG in contiguous leads	STEMI	Immediate reperfusion (primary PCI preferred; fibrinolysis if PCI not available within 120 minutes)
Dynamic ST depression or T-wave inversion with elevated troponin	NSTEMI	Admit; DAPT plus anticoagulation; risk stratify for timing of invasive strategy
Ischemic symptoms with normal or non-diagnostic ECG, troponin pending	Possible ACS	Serial ECGs; serial troponins at 0, 3 hours (or 0, 1, 3 with hs-troponin); apply HEART score
Pleuritic pain, dyspnea, tachycardia, risk factors for VTE	Pulmonary embolism	Calculate Wells score; if low/moderate and PERC negative, may avoid testing; otherwise D-dimer or CT angiography
Sudden tearing pain to back, BP differential between arms	Aortic dissection	Emergent CT angiography; IV beta-blocker first, then vasodilator for BP control; surgical consultation
Sharp positional pain, recent viral illness, friction rub	Acute pericarditis	ECG (diffuse ST elevation, PR depression); echo to assess effusion; NSAIDs plus colchicine
Sudden dyspnea, absent breath sounds, hyperresonance on one side	Pneumothorax	Chest X-ray; if tension physiology, immediate needle decompression; chest tube for large pneumothorax
Severe pain after forceful vomiting, subcutaneous emphysema	Esophageal rupture	CT chest with oral contrast; NPO, IV antibiotics, surgical consultation

Algorithm B: Subacute Chest Pain (Days to Weeks)

Clinical Scenario	Most Likely Diagnosis	Action
Fever, productive cough, pleuritic pain, abnormal chest X-ray	Community-acquired pneumonia	Severity assessment (CURB-65 or PSI); appropriate antibiotics; oxygen if hypoxemic
Persistent sharp positional pain after viral illness, elevated inflammatory markers	Pericarditis (subacute or recurrent)	Echo to assess for effusion; NSAIDs plus colchicine; consider steroid-sparing if recurrent
Dermatomal pain preceding vesicular rash	Herpes zoster	Antiviral therapy (valacyclovir) if within 72 hours of rash; pain management; monitor for complications
Exertional symptoms with risk factors, previously stable now worsening	Progressive angina (possible unstable)	ECG, troponin; if normal, urgent outpatient stress testing; if abnormal, manage as ACS
Localized tenderness at costochondral junction for several weeks	Costochondritis	NSAIDs, local measures; reassurance; ensure cardiac causes excluded if risk factors

Algorithm C: Chronic Chest Pain (>4 Weeks)

Clinical Scenario	Most Likely Diagnosis	Action
Predictable exertional symptoms, relieved by rest, multiple cardiac risk factors	Stable angina pectoris	Stress testing (exercise ECG, stress echo, or nuclear); if positive, coronary angiography; optimize medical therapy
Burning retrosternal discomfort, worse postprandially, responds to antacids	Gastroesophageal reflux disease	Empiric PPI trial; if refractory or alarm features, upper endoscopy
Multiple tender points, fatigue, widespread pain, no objective findings	Fibromyalgia	Diagnosis of exclusion; multidisciplinary approach with physical therapy, medications (duloxetine, pregabalin), cognitive behavioral therapy
Episodic chest tightness with palpitations, hyperventilation, anxiety	Panic disorder	Exclude cardiac disease first; then cognitive behavioral therapy, SSRIs for prevention, reassurance
Chronic chest discomfort, extensive negative workup, visceral hypersensitivity	Functional chest pain	Reassurance; low-dose tricyclic antidepressant; cognitive behavioral therapy; avoid repeated unnecessary testing

Acute Coronary Syndrome Decision Pathway

HEART Score Pathway for Chest Pain:

Calculate HEART score (History, ECG, Age, Risk factors, Troponin):

Score 0-3 (Low Risk): 30-day MACE risk ~1-2%; consider early discharge with outpatient follow-up
Score 4-6 (Moderate Risk): 30-day MACE risk ~12-17%; admit for observation, serial troponins, stress testing or CT coronary angiography
Score 7-10 (High Risk): 30-day MACE risk ~50-65%; admit, initiate ACS therapy, early invasive strategy

“What Do I Do If…” Decision Reference

Clinical Situation	Immediate Action	Next Step
ECG shows ST elevation but patient is pain-free	Repeat ECG; compare with prior ECG if available	If persistent and no prior history of similar ECG, treat as STEMI until proven otherwise; consider early repolarization, LVH, old MI as alternatives
Troponin is elevated but ECG is normal	Repeat troponin in 3 hours to assess for rise/fall pattern	Consider Type 2 MI (demand ischemia), myocarditis, PE, renal failure, heart failure; clinical context determines further workup
Patient has cocaine-associated chest pain	ECG, troponin, benzodiazepines for agitation	Avoid beta-blockers (risk of unopposed alpha effect); use benzodiazepines, nitroglycerin, calcium channel blockers; cardiology consultation
Young patient with chest pain and normal initial workup	Detailed history for red flags; consider atypical causes	If very low risk (age <40, no risk factors, typical musculoskeletal), may discharge with close follow-up; if any concern, serial troponins
Elderly patient with vague symptoms and normal ECG	Lower threshold for admission and testing; atypical presentations are common	Serial troponins; consider stress testing or CT coronary angiography given higher pretest probability
Chest pain reproducible with palpation	Do NOT use this to rule out cardiac disease	If patient has cardiac risk factors, proceed with full evaluation including ECG and troponin despite reproducible tenderness
D-dimer is elevated but clinical probability for PE is low	D-dimer has many causes of elevation (age, infection, malignancy, pregnancy)	If clinical probability truly low and no other PE features, may observe; if any doubt, proceed to CT pulmonary angiography
Suspected aortic dissection but patient needs CT with contrast and has renal impairment	Do NOT delay imaging for life-threatening condition	Proceed with CT angiography; hydration if time permits; dialysis can address contrast nephropathy but death from missed dissection cannot be reversed
Patient requests discharge against medical advice before workup complete	Clearly explain risks of missed life-threatening diagnosis	Document conversation thoroughly; provide instructions to return immediately if symptoms worsen; ensure patient has capacity to make decision

Troubleshooting Refractory or Unexplained Chest Pain

Systematic Review Questions

When chest pain remains unexplained after initial evaluation:

Was the initial diagnosis correct? Re-review history and consider alternative diagnoses
Were all “Killer Five” adequately excluded? Review for missed PE, dissection, or atypical ACS presentation
Are there multiple overlapping causes? Patients may have GERD AND coronary disease simultaneously
Is this functional chest pain? After thorough exclusion of organic disease, consider visceral hypersensitivity
Has enough time passed? Some diagnoses (evolving MI, developing zoster) may only become clear over time
Is the patient taking medications as prescribed? Non-adherence may explain treatment failure
Are there psychosocial factors? Anxiety, depression, and somatization are common in unexplained chest pain

Disposition Decision Framework

Disposition	Criteria	Requirements Before Discharge/Transfer
Discharge Home	Low-risk features; HEART score 0-3; negative serial troponins; alternative diagnosis established (e.g., clear musculoskeletal cause); stable vital signs	Clear discharge instructions; return precautions; follow-up arranged; consider outpatient stress testing if intermediate concern
Observation Unit	Moderate risk; need serial troponins; may need stress testing; hemodynamically stable; no high-risk features	Telemetry monitoring; serial troponins complete; stress test or CT coronary angiography prior to discharge if indicated
Hospital Admission	High-risk features; positive troponin with rise/fall; ongoing symptoms; hemodynamic instability; need for intervention	Monitored bed; cardiology consultation; ACS protocol if appropriate; determine timing of invasive strategy
ICU/CCU Admission	Hemodynamic instability; cardiogenic shock; arrhythmia requiring close monitoring; massive PE; aortic dissection	Continuous monitoring; immediate access to interventional capabilities; critical care consultation

8. Clinical Pearls and Pitfalls

Practical wisdom — learn from successes and avoid common mistakes

Must-Know Clinical Pearls

The “Killer Five” rule: Every patient with chest pain must be systematically evaluated for acute coronary syndrome, pulmonary embolism, aortic dissection, tension pneumothorax, and esophageal rupture before benign diagnoses are considered.

Time is muscle: In STEMI, every 30-minute delay in reperfusion results in measurable additional myocardial loss. Door-to-balloon time less than 90 minutes is the standard; prehospital ECG transmission saves lives.

Atypical is typical in certain populations: Women, elderly patients, and diabetics frequently present with atypical symptoms of acute coronary syndrome—dyspnea, fatigue, nausea, or pain in atypical locations may be the only manifestation.

Bilateral blood pressures: A systolic difference greater than 20 mmHg between arms has high specificity for aortic dissection. This simple bedside maneuver takes seconds and can be lifesaving.

Serial troponins are essential: A single troponin at presentation may be falsely negative if drawn too early. High-sensitivity troponin protocols with 0 and 3-hour measurements (or 0, 1, and 3 hours) are required for safe rule-out.

Think pulmonary embolism: Pulmonary embolism is the great masquerader. Consider it in any patient with unexplained dyspnea, pleuritic pain, tachycardia, or syncope, especially with venous thromboembolism risk factors.

Pericarditis has a classic ECG: Diffuse ST elevation with PR depression, sparing aVR (which shows PR elevation and ST depression), is virtually diagnostic. The ST elevation is concave up (“smiley face”) unlike the convex elevation of STEMI.

Risk stratification guides management: Use validated scores (HEART for ACS, Wells for PE, ADD-RS for dissection) to guide testing intensity and disposition. Gestalt alone is less reliable than structured assessment.

Critical Pitfalls to Avoid

Relying on nitroglycerin response: Relief with nitroglycerin does NOT confirm cardiac origin—esophageal spasm also responds to nitrates. Similarly, relief with antacids does not exclude acute coronary syndrome.

Using reproducible tenderness to rule out cardiac disease: Up to 15% of patients with confirmed myocardial infarction have reproducible chest wall tenderness. Palpation findings should never be used to exclude cardiac evaluation in patients with risk factors.

Trusting a single normal troponin: Troponin takes time to rise after myocardial injury. A single negative troponin at presentation, especially if drawn within 3 hours of symptom onset, cannot rule out acute myocardial infarction.

Missing aortic dissection because chest X-ray is normal: Widened mediastinum is present in only about 60% of dissections. If clinical suspicion exists, CT angiography is required regardless of chest X-ray findings.

Giving beta-blockers to cocaine chest pain: Beta-blockers in cocaine-associated chest pain can cause unopposed alpha-adrenergic stimulation, worsening coronary vasoconstriction and hypertension. Use benzodiazepines and nitroglycerin instead.

Dismissing chest pain in young patients: While rare, acute coronary syndrome can occur in young adults, especially with cocaine use, familial hyperlipidemia, or Kawasaki disease history. Age alone should not determine evaluation intensity.

Anchoring on an initial diagnosis: Chest pain often has multiple potential causes. If a patient doesn’t improve as expected or develops new features, revisit the differential and consider alternative or additional diagnoses.

Delaying imaging for suspected dissection due to renal function: Aortic dissection is a surgical emergency with high mortality if missed. The risk of contrast nephropathy is far outweighed by the risk of death from undiagnosed dissection. Proceed with CT angiography.

Key Takeaways

Chest pain is one of the most common and highest-stakes complaints in medicine; systematic evaluation is essential to avoid missing life-threatening diagnoses.
The “Killer Five”—acute coronary syndrome, pulmonary embolism, aortic dissection, tension pneumothorax, and esophageal rupture—must be considered in every patient with acute chest pain.
Clinical features can suggest but rarely confirm or exclude diagnoses; integration of history, examination, and investigations is required.
Atypical presentations of acute coronary syndrome are common in women, elderly patients, and diabetics—maintain a high index of suspicion in these populations.
A normal ECG does not rule out acute coronary syndrome; serial ECGs and troponins are required for safe evaluation.
Treatment response (to nitroglycerin, antacids, or NSAIDs) does not reliably distinguish cardiac from non-cardiac chest pain.
Reproducible chest wall tenderness does not exclude cardiac disease—up to 15% of myocardial infarction patients have this finding.
Risk stratification using validated clinical decision tools (HEART, Wells, ADD-RS) improves diagnostic accuracy and guides appropriate resource utilization.
Pulmonary embolism should be considered in any patient with unexplained dyspnea, pleuritic pain, or tachycardia, particularly with venous thromboembolism risk factors.
For suspected aortic dissection, measure blood pressure in both arms and proceed to CT angiography if clinical suspicion exists, regardless of chest X-ray findings.
In cocaine-associated chest pain, avoid beta-blockers due to risk of unopposed alpha stimulation; use benzodiazepines and nitroglycerin instead.
Functional chest pain is a diagnosis of exclusion; thorough evaluation must precede this label, but once established, reassurance and targeted therapies can be effective.

Quick Reference Algorithm

Systematic Approach to Chest Pain:

Assess stability: Vital signs, airway, breathing, circulation—is this patient in extremis?
Obtain ECG within 10 minutes: Look for STEMI, ischemic changes, arrhythmia, pericarditis pattern, or signs of PE.
Consider the “Killer Five”: ACS, PE, aortic dissection, tension pneumothorax, esophageal rupture—can any be excluded clinically?
Risk stratify: Apply HEART score, Wells score, or ADD-RS as appropriate to guide testing intensity.
Order targeted investigations: Troponin, chest X-ray, and additional tests based on clinical suspicion (D-dimer, CT angiography, echocardiography).
Reassess with results: Integrate findings with clinical picture; repeat ECG if symptoms change.
Determine disposition: Discharge, observation, admission, or ICU based on risk and need for intervention.
Ensure follow-up: Clear discharge instructions, return precautions, and appropriate outpatient follow-up for all patients.

Final Clinical Wisdom

When in Doubt…

Err on the side of caution—missed life-threatening diagnoses have worse outcomes than overtesting
Repeat the ECG if symptoms persist or change
Get serial troponins rather than relying on a single value
Consult cardiology early for complex or uncertain cases
Trust your clinical instinct but verify with objective data

Communication Matters

Explain your reasoning to patients—it builds trust and improves compliance
Provide clear discharge instructions with specific return precautions
Document your clinical reasoning thoroughly
Ensure reliable follow-up is arranged before discharge
When uncertain, share uncertainty honestly with patients and colleagues