Clinical Approach to Chest Pain
Comprehensive Practical Framework1. Symptom Overview
Understanding the clinical significance and classification of chest pain
Chest pain is one of the most common and clinically significant symptoms encountered in medical practice. It accounts for approximately 6 to 8 million emergency department visits annually in the United States, representing about 5% of all emergency visits. In primary care settings, chest pain is among the top 20 reasons for outpatient consultations, affecting approximately 1% to 2% of the adult population each year. While the majority of cases have benign etiologies, chest pain carries significant weight because it can herald life-threatening conditions including acute coronary syndrome, pulmonary embolism, and aortic dissection.
Definition
Chest pain refers to any discomfort or abnormal sensation localized to the thoracic region, bounded superiorly by the clavicles, inferiorly by the diaphragm, and laterally by the axillary lines. The sensation may originate from cardiac, pulmonary, gastrointestinal, musculoskeletal, neurological, or psychological sources, and its character varies widely from sharp and stabbing to dull, pressure-like, or burning.
Key Epidemiology
- Emergency presentations: Only 15% to 25% of patients presenting with chest pain to the emergency department have acute coronary syndrome
- Musculoskeletal causes: Account for 30% to 50% of chest pain in primary care
- Gastrointestinal causes: Responsible for 10% to 20% of chest pain presentations
- Psychological causes: Panic disorder and anxiety contribute to 5% to 10% of cases
- Mortality consideration: Despite most causes being benign, missing acute coronary syndrome carries a 2% to 4% short-term mortality risk
Classification by Duration
| Category | Duration | Common Causes | Clinical Significance |
|---|---|---|---|
| Acute | Less than 1 week | Acute coronary syndrome, pulmonary embolism, pneumothorax, aortic dissection, pneumonia, pericarditis | High index of suspicion for life-threatening causes; requires urgent evaluation and risk stratification |
| Subacute | 1 to 4 weeks | Costochondritis, viral pleuritis, post-infectious inflammation, herpes zoster prodrome | Often inflammatory or post-infectious; evaluate for evolving conditions |
| Chronic | Greater than 4 weeks | Stable angina, gastroesophageal reflux disease, chronic musculoskeletal pain, anxiety and panic disorder | Focus shifts to functional assessment, quality of life, and ruling out occult malignancy in appropriate populations |
Classification by Character
Visceral Pain
Description: Deep, poorly localized, dull, pressure-like, or squeezing sensation. Often described as “heaviness,” “tightness,” or “like an elephant sitting on my chest.”
Clinical implications: Suggests cardiac ischemia, esophageal disease, or other visceral organ involvement. Patients often use an open palm or clenched fist over the sternum (Levine sign) rather than pointing with a finger.
Somatic Pain
Description: Sharp, well-localized, stabbing, or knife-like pain that patients can often point to with one finger.
Clinical implications: Suggests musculoskeletal, pleural, or pericardial origin. Often reproducible with palpation, movement, or respiration. Less concerning for cardiac ischemia but does not exclude it entirely.
Classification by Quality
| Quality | Description | Suggests |
|---|---|---|
| Pressure or squeezing | Substernal tightness, constricting sensation, “band around chest” | Cardiac ischemia, esophageal spasm |
| Sharp or stabbing | Knife-like, piercing, well-localized | Pleuritis, pericarditis, musculoskeletal, pneumothorax |
| Burning | Heartburn-like, epigastric radiation | Gastroesophageal reflux disease, esophagitis, sometimes cardiac ischemia |
| Tearing or ripping | Severe, sudden onset, radiating to back | Aortic dissection (classic description) |
| Aching | Dull, constant, diffuse | Musculoskeletal strain, costochondritis |
Classification by Pattern and Timing
| Pattern | Description | Suggests |
|---|---|---|
| Exertional | Predictably triggered by physical activity, relieved by rest within minutes | Stable angina pectoris, exercise-induced asthma |
| Rest pain | Occurs without provocation, often nocturnal or early morning | Unstable angina, variant (Prinzmetal) angina, gastroesophageal reflux disease |
| Postprandial | Occurs after meals, especially large or fatty meals | Gastroesophageal reflux disease, peptic ulcer disease, biliary colic, mesenteric ischemia |
| Pleuritic | Sharp pain worsened by deep inspiration, coughing, or sneezing | Pleuritis, pericarditis, pulmonary embolism, pneumonia, pneumothorax |
| Positional | Varies with body position, often worse supine | Pericarditis (relieved by leaning forward), gastroesophageal reflux disease (worse lying flat) |
| Reproducible with movement | Triggered or worsened by specific arm or trunk movements | Musculoskeletal causes, costochondritis |
Key Concept: The “Big Five” Life-Threatening Causes
When evaluating acute chest pain, always systematically consider and exclude the five major life-threatening causes:
- Acute coronary syndrome — myocardial infarction or unstable angina
- Aortic dissection — catastrophic if missed
- Pulmonary embolism — often presents atypically
- Tension pneumothorax — clinical diagnosis requiring immediate intervention
- Esophageal rupture (Boerhaave syndrome) — rare but rapidly fatal if untreated
These five conditions account for the majority of chest pain-related mortality and must be rapidly assessed in any acute presentation.
2. Pathophysiology and Mechanisms
Understanding the underlying mechanisms of chest pain
Chest pain arises from stimulation of nociceptors in various thoracic structures. Understanding the neuroanatomy of chest pain pathways is essential for interpreting pain characteristics and localizing the source. The chest wall, pleura, pericardium, esophagus, and heart all have distinct innervation patterns that produce characteristic pain presentations. Visceral afferents from the heart and esophagus share common spinal cord segments (T1-T5), explaining the frequent difficulty in distinguishing cardiac from esophageal pain.
The Chest Pain Neural Pathway
| Component | Structure | Function |
|---|---|---|
| Nociceptors | Free nerve endings in cardiac muscle, pericardium, pleura, chest wall, esophagus, and great vessels | Detect tissue damage, ischemia, inflammation, mechanical stretch, and chemical irritation |
| Afferent Pathway | Cardiac sympathetic nerves (T1-T5), vagus nerve, phrenic nerve, intercostal nerves, somatic nerves | Transmit pain signals from thoracic structures to the spinal cord and brainstem |
| Spinal Processing | Dorsal horn neurons, spinothalamic tract | Integration of visceral and somatic inputs; convergence creates referred pain patterns |
| Central Processing | Thalamus, somatosensory cortex, limbic system | Conscious perception of pain, emotional response, localization |
| Modulation | Descending pathways, endogenous opioids | Pain modulation explains variable pain perception in similar pathology (e.g., silent ischemia in diabetics) |
Innervation Patterns and Clinical Relevance
Cardiac Innervation
Nerves: Cardiac sympathetic afferents via stellate and middle cervical ganglia (T1-T5), vagal afferents
Pain pattern: Poorly localized, substernal, radiating to left arm, neck, jaw
Clinical relevance: Visceral afferent convergence with somatic neurons at T1-T5 explains referred pain to arm and jaw. Vagal involvement explains associated nausea and diaphoresis.
Pleural and Pericardial Innervation
Nerves: Parietal pleura and pericardium innervated by intercostal and phrenic nerves (somatic)
Pain pattern: Sharp, well-localized, pleuritic (worsened by breathing)
Clinical relevance: Phrenic nerve involvement causes referred shoulder pain. Visceral pleura and visceral pericardium are insensate, explaining why large effusions may be painless.
Esophageal Innervation
Nerves: Vagal afferents and spinal sympathetic afferents (T1-T5)
Pain pattern: Substernal burning, pressure, or spasm; may radiate to back
Clinical relevance: Shares spinal segments with cardiac afferents, making esophageal and cardiac pain frequently indistinguishable without investigation.
How Conditions Cause Chest Pain
| Condition | Mechanism of Pain | Clinical and Treatment Implication |
|---|---|---|
| Acute coronary syndrome | Myocardial ischemia leads to anaerobic metabolism, lactate and adenosine accumulation, stimulating cardiac nociceptors. Plaque rupture and thrombus formation cause acute supply-demand mismatch. | Pain correlates poorly with infarct size. Diabetics and elderly may have “silent” presentations due to autonomic neuropathy. Treatment targets revascularization. |
| Stable angina pectoris | Fixed coronary stenosis limits flow during increased demand; ischemia is predictable and reproducible with exertion. | Pain threshold correlates with degree of stenosis. Responds to rest and nitrates. Guides decision for medical versus interventional management. |
| Aortic dissection | Intimal tear allows blood to enter media, stretching adventitial nociceptors. Propagation causes migrating pain. | “Tearing” pain radiating to back is classic. Pain migration suggests dissection propagation. Requires urgent blood pressure control and surgical evaluation. |
| Pulmonary embolism | Large emboli cause right ventricular strain and myocardial ischemia. Peripheral emboli cause pulmonary infarction with pleural inflammation. | Central PE causes substernal pressure; peripheral PE causes pleuritic pain. Hypoxia and tachycardia may be only signs. Anticoagulation is mainstay of treatment. |
| Pericarditis | Inflammation of parietal pericardium stimulates somatic phrenic and intercostal nerve endings. | Sharp, pleuritic pain relieved by sitting forward (reduces pericardial stretch). Responds to anti-inflammatory agents. |
| Gastroesophageal reflux disease | Acid exposure sensitizes esophageal nociceptors; spasm activates stretch receptors. Shares T1-T5 afferents with heart. | Burning substernal pain worse postprandially and supine. May mimic angina. Proton pump inhibitors are both diagnostic and therapeutic. |
| Esophageal spasm | Uncoordinated smooth muscle contractions stimulate stretch receptors; may be triggered by acid reflux or temperature. | Can precisely mimic angina and even respond to nitrates (smooth muscle relaxation). Manometry is diagnostic. |
| Costochondritis | Inflammation of costochondral or costosternal joints activates local somatic nociceptors in chest wall. | Point tenderness is reproducible on examination. Reassurance and anti-inflammatory agents are mainstays. |
| Pneumothorax | Sudden pleural separation stretches parietal pleura; lung collapse causes ventilation-perfusion mismatch. | Sudden onset pleuritic pain with dyspnea. Tension pneumothorax causes mediastinal shift and hemodynamic collapse. |
| Panic disorder | Sympathetic hyperactivation, hyperventilation causing respiratory alkalosis, and heightened somatic awareness create genuine pain perception. | Diagnosis of exclusion. Physical symptoms are real; psychological treatment addresses underlying anxiety. |
Understanding Referred Pain in Chest Pain
Why does cardiac pain radiate to the arm and jaw?
Visceral afferents from the heart enter the spinal cord at T1-T5 and converge on the same second-order neurons that receive somatic input from the arm, neck, and jaw. The brain cannot distinguish the source and interprets the signal as originating from the more commonly stimulated somatic distribution. This “viscerosomatic convergence” explains:
- Left arm pain in myocardial infarction (T1-T2 dermatomes)
- Jaw and neck pain (cervical afferent convergence)
- Epigastric pain in inferior myocardial infarction (T5 overlap with abdominal viscera)
- Shoulder pain in pericarditis (phrenic nerve, C3-C5)
Often Overlooked: Silent Ischemia
Up to 25% of myocardial infarctions are clinically “silent,” detected only by subsequent ECG changes or imaging. This is particularly common in:
- Diabetic patients: Autonomic neuropathy impairs cardiac afferent transmission
- Elderly patients: Age-related decrease in pain perception and atypical presentations (dyspnea, fatigue, confusion)
- Post-transplant patients: Denervated hearts lack afferent pain pathways
- Women: More likely to present with atypical symptoms (fatigue, nausea, back pain)
A low threshold for investigation is essential in these populations, even without classic chest pain.
Myocardial Oxygen Supply-Demand Balance
| Factor | Increases Oxygen Demand | Decreases Oxygen Supply |
|---|---|---|
| Heart rate | Tachycardia increases myocardial work | Tachycardia shortens diastole, reducing coronary filling time |
| Blood pressure | Hypertension increases afterload and wall stress | Hypotension reduces coronary perfusion pressure |
| Contractility | Increased inotropy raises oxygen consumption | — |
| Preload | Increased ventricular volume raises wall tension | — |
| Coronary flow | — | Atherosclerosis, spasm, thrombosis, or compression reduce flow |
| Oxygen carrying capacity | — | Anemia, carbon monoxide poisoning reduce oxygen delivery |
Clinical Application: Type 1 vs Type 2 Myocardial Infarction
Type 1 MI: Primary coronary event (plaque rupture, thrombosis) — requires urgent revascularization
Type 2 MI: Supply-demand mismatch without acute plaque event (severe anemia, hypotension, tachyarrhythmia, respiratory failure) — treat underlying cause
Understanding this distinction guides appropriate management and avoids unnecessary invasive procedures.
3. History Taking
A comprehensive approach to eliciting the chest pain history
Red Flags — Require Urgent Evaluation
- Sudden severe “tearing” pain radiating to back — Aortic dissection
- Pain with syncope or near-syncope — Arrhythmia, massive pulmonary embolism, aortic dissection
- Pain with hemodynamic instability — Cardiogenic shock, tension pneumothorax
- Pain with acute dyspnea and hypoxia — Pulmonary embolism, pneumothorax, acute heart failure
- Pain with diaphoresis, nausea, and pallor — Acute coronary syndrome
- New chest pain in known coronary artery disease — Unstable angina or myocardial infarction
- Pain following recent vomiting (Boerhaave syndrome) — Esophageal rupture
- Unilateral leg swelling with chest pain — Deep vein thrombosis with pulmonary embolism
- Pain with new neurological deficits — Aortic dissection involving cerebral vessels
- Pain with pulse differential between arms — Aortic dissection
Systematic History: The “CHEST PAINS” Approach
Use the mnemonic “CHEST PAINS” to ensure comprehensive history taking for any patient presenting with chest pain:
- C — Character: What does the pain feel like? (Pressure, sharp, burning, tearing, aching)
- H — How did it start: Sudden versus gradual onset? What were you doing when it began?
- E — Exacerbating and relieving factors: What makes it worse? What makes it better? Effect of rest, position, breathing, food?
- S — Site and radiation: Where exactly is the pain? Does it spread anywhere (arm, jaw, back, shoulder)?
- T — Timing and duration: How long does each episode last? Constant versus intermittent? Time of day pattern?
- P — Previous episodes: Have you had this before? Similar to previous heart problems? Previous investigations?
- A — Associated symptoms: Dyspnea, diaphoresis, nausea, vomiting, palpitations, syncope, cough, fever?
- I — Intensity: Severity on 0-10 scale? Worst pain ever? How does it compare to previous episodes?
- N — Nitrate response: If applicable, did sublingual nitroglycerin help? (Note: also relieves esophageal spasm)
- S — Secondary survey: Risk factors, medications, family history, social history
Targeted Questions by Suspected Cause
| Suspected Cause | Key Features | Ask This Question |
|---|---|---|
| Acute coronary syndrome | Substernal pressure, radiation to arm/jaw, diaphoresis, nausea, dyspnea | “Does the pain feel like pressure or tightness? Does it spread to your arm, neck, or jaw? Are you sweating or feeling nauseated?” |
| Stable angina | Predictable exertional pain, relieved by rest within minutes | “Does the pain come on when you walk or climb stairs? Does it go away within a few minutes of resting?” |
| Aortic dissection | Sudden severe tearing pain, radiates to back, maximal at onset | “Did the pain start suddenly and severely, or build up gradually? Does it feel like something is tearing? Does it go through to your back?” |
| Pulmonary embolism | Pleuritic pain, dyspnea, risk factors (immobility, surgery, cancer, oral contraceptives) | “Is the pain worse when you take a deep breath? Have you had any recent surgery, long travel, or been immobile? Any leg swelling or calf pain?” |
| Pericarditis | Sharp pleuritic pain, worse supine, relieved leaning forward, recent viral illness | “Is the pain worse when you lie flat and better when you sit up and lean forward? Have you had a cold or flu recently?” |
| Pneumothorax | Sudden pleuritic pain, dyspnea, often in tall thin males or those with lung disease | “Did the pain start very suddenly? Are you short of breath? Do you have any lung conditions like emphysema or asthma?” |
| Gastroesophageal reflux disease | Burning pain, worse postprandially and supine, associated with regurgitation | “Is the pain burning in quality? Is it worse after meals or when you lie down? Do you get acid or food coming back up?” |
| Esophageal spasm | Substernal squeezing, may mimic angina, triggered by hot/cold liquids | “Does the pain come on when you swallow? Is it triggered by very hot or cold drinks? Does it feel like food is getting stuck?” |
| Costochondritis | Localized chest wall tenderness, reproducible with palpation | “Can you point with one finger to where the pain is? Does it hurt when you press on your chest or move your arms?” |
| Panic disorder | Associated with anxiety, palpitations, paresthesias, sense of doom | “Do you feel anxious or scared when the pain occurs? Do you get tingling in your hands or face? Do you feel like something terrible is about to happen?” |
| Herpes zoster | Dermatomal distribution, burning/dysesthetic quality, may precede rash | “Is the pain in a band-like pattern around one side of your chest? Does it burn or tingle? Have you noticed any rash or blisters?” |
Cardiovascular Risk Factor Assessment
Traditional Cardiovascular Risk Factors
Always assess for established risk factors that increase pretest probability for coronary artery disease:
- Age: Male greater than 45 years, female greater than 55 years (or premature menopause)
- Sex: Male sex confers higher risk; however, women have higher mortality when acute coronary syndrome occurs
- Family history: First-degree relative with coronary artery disease before age 55 (male) or 65 (female)
- Smoking: Current or recent (within 3 years) tobacco use
- Hypertension: Blood pressure greater than 140/90 mmHg or on antihypertensive therapy
- Diabetes mellitus: Particularly important; diabetics may have atypical or silent presentations
- Dyslipidemia: Elevated LDL cholesterol, low HDL cholesterol, elevated triglycerides
- Obesity: Body mass index greater than 30 kg/m²
- Chronic kidney disease: Markedly increases cardiovascular risk
- Known vascular disease: Peripheral arterial disease, prior stroke, known coronary artery disease
Medication and Social History
Medications Relevant to Chest Pain
- Antianginal medications: Nitrates, beta-blockers, calcium channel blockers — suggests known coronary artery disease; assess symptom control
- Antiplatelet agents: Aspirin, clopidogrel — indicates established cardiovascular disease
- Anticoagulants: Warfarin, direct oral anticoagulants — may indicate atrial fibrillation, prior venous thromboembolism
- Proton pump inhibitors: Suggests gastroesophageal reflux disease; assess response
- Cocaine or amphetamines: Potent vasoconstrictors; can cause coronary spasm and myocardial infarction in young patients
- Phosphodiesterase-5 inhibitors: Sildenafil, tadalafil — contraindicate nitrate use
- Nonsteroidal anti-inflammatory drugs: May mask musculoskeletal pain; cardiovascular risks with chronic use
- Oral contraceptives or hormone replacement: Increase thrombotic risk for pulmonary embolism
Social and Occupational History
- Smoking: Pack-years calculation; assess for chronic obstructive pulmonary disease and coronary artery disease risk
- Alcohol: Heavy use associated with cardiomyopathy, atrial fibrillation, pancreatitis
- Recreational drugs: Cocaine causes coronary vasospasm and accelerated atherosclerosis; amphetamines cause tachyarrhythmias
- Occupation: Heavy lifting (musculoskeletal strain), sedentary work (venous thromboembolism risk), high stress (cardiovascular risk)
- Recent travel: Long-haul flights increase deep vein thrombosis and pulmonary embolism risk
- Recent immobility: Surgery, hospitalization, prolonged bed rest — thrombotic risk
- Exercise habits: Level of baseline fitness helps interpret exertional symptoms
- Diet: High-fat diet, excessive caffeine (palpitations), trigger foods for reflux
Pulmonary Embolism Risk Assessment Questions
| Risk Factor Category | Specific Questions to Ask |
|---|---|
| Immobilization | “Have you been on bed rest for more than 3 days? Recent long flight or car journey (greater than 4 hours)? Recent cast or immobilization of a limb?” |
| Surgery or trauma | “Have you had any surgery in the past 4 weeks, especially hip, knee, or abdominal surgery? Any recent major trauma?” |
| Malignancy | “Have you been diagnosed with cancer? Are you currently receiving chemotherapy or radiation therapy?” |
| Prior venous thromboembolism | “Have you ever had a blood clot in your leg or lungs before?” |
| Hormonal factors | “Are you taking oral contraceptives or hormone replacement therapy? Are you currently pregnant or recently postpartum?” |
| Thrombophilia | “Does anyone in your family have a blood clotting disorder? Have you or family members had unexplained blood clots?” |
4. Physical Examination
A systematic head-to-toe approach for chest pain
Systematic Framework: Use the “Observation → Vitals → Head-to-Toe” approach for complete examination of patients presenting with chest pain. Begin with overall assessment of stability before proceeding to detailed examination.
General Inspection
- Appearance: Distress level, anxiety, diaphoresis, pallor, cyanosis, clutching chest (Levine sign suggests cardiac origin)
- Respiratory effort: Tachypnea, use of accessory muscles, inability to speak in full sentences, tripod positioning
- Color: Pallor (anemia, shock), cyanosis (hypoxia), mottling (poor perfusion), jaundice (liver disease)
- Body habitus: Marfanoid features (tall, thin, arm span greater than height, pectus excavatum) — associated with aortic dissection and spontaneous pneumothorax
- Mental status: Confusion or altered consciousness suggests hypoperfusion or hypoxia — this is a medical emergency
Vital Signs
| Vital Sign | What to Look For | Clinical Significance |
|---|---|---|
| Heart Rate | Tachycardia (greater than 100), bradycardia (less than 60), irregularity | Tachycardia in pulmonary embolism, acute coronary syndrome, anxiety, pain. Bradycardia in inferior myocardial infarction (vagal), high-grade atrioventricular block. Irregular rhythm suggests atrial fibrillation. |
| Blood Pressure | Hypertension, hypotension, differential between arms (greater than 20 mmHg systolic) | Severe hypertension with aortic dissection. Hypotension in cardiogenic shock, massive pulmonary embolism, tension pneumothorax, cardiac tamponade. Arm differential suggests aortic dissection involving subclavian artery. |
| Respiratory Rate | Tachypnea (greater than 20), bradypnea | Tachypnea is sensitive but nonspecific — seen in pulmonary embolism, pneumonia, heart failure, anxiety, metabolic acidosis. Respiratory rate greater than 30 indicates severe distress. |
| Oxygen Saturation | Hypoxemia (less than 94% on room air) | Hypoxia in pulmonary embolism, pneumonia, pneumothorax, pulmonary edema. Note: may be preserved in acute coronary syndrome. Pulse oximetry may be unreliable in poor perfusion states. |
| Temperature | Fever (greater than 38°C), hypothermia | Fever suggests infection (pneumonia, pericarditis, mediastinitis from esophageal rupture). Low-grade fever can occur 24-48 hours post-myocardial infarction. |
Cardiovascular Examination
Inspection
- Jugular venous pressure: Elevated in right heart failure, pulmonary embolism, cardiac tamponade, tension pneumothorax
- Kussmaul sign: Paradoxical rise in jugular venous pressure with inspiration — suggests constrictive pericarditis or tamponade
- Visible apex beat: Displaced laterally in cardiomegaly
Palpation
- Apex beat: Location (displaced in cardiomegaly), character (heaving in left ventricular hypertrophy, diffuse in dilated cardiomyopathy)
- Right ventricular heave: Parasternal lift suggests right ventricular pressure or volume overload (pulmonary hypertension, pulmonary embolism)
- Thrills: Palpable murmurs indicate significant valvular disease
- Peripheral pulses: Compare radial pulses bilaterally (asymmetry in aortic dissection); assess femoral pulses (diminished or delayed in aortic dissection, coarctation)
Auscultation
| Finding | Description | Associated Conditions |
|---|---|---|
| S3 gallop | Low-pitched sound in early diastole, best heard at apex with bell | Left ventricular systolic dysfunction, acute heart failure, volume overload |
| S4 gallop | Late diastolic sound, presystolic, best heard at apex | Reduced ventricular compliance: hypertensive heart disease, acute ischemia, hypertrophic cardiomyopathy |
| Pericardial friction rub | Scratchy, squeaky three-component sound (atrial systole, ventricular systole, ventricular diastole); best heard at left sternal border with patient leaning forward | Acute pericarditis — may be evanescent; absence does not exclude diagnosis |
| New systolic murmur | Holosystolic murmur at apex or left sternal border | Acute mitral regurgitation (papillary muscle rupture post-myocardial infarction), ventricular septal rupture — surgical emergencies |
| Aortic regurgitation murmur | Early diastolic decrescendo murmur at left sternal border | Aortic dissection involving aortic root, endocarditis, chronic aortic root disease |
| Muffled heart sounds | Distant, quiet heart sounds | Pericardial effusion, cardiac tamponade, obesity, hyperinflation (emphysema) |
Respiratory Examination
Inspection
- Chest wall symmetry: Asymmetric expansion in pneumothorax (affected side moves less), large pleural effusion
- Accessory muscle use: Sternocleidomastoid, intercostal retraction — indicates significant respiratory distress
- Tracheal position: Deviation away from affected side in tension pneumothorax, large effusion; toward affected side in collapse
Palpation
- Chest wall tenderness: Reproducible tenderness suggests musculoskeletal cause (costochondritis, rib fracture) — but does not exclude cardiac disease
- Subcutaneous emphysema: Crepitus under skin indicates air tracking — pneumothorax, pneumomediastinum, esophageal rupture
- Tactile fremitus: Decreased in effusion and pneumothorax; increased in consolidation
Percussion
- Hyperresonance: Pneumothorax
- Dullness: Pleural effusion, consolidation, hemothorax
Auscultation
| Finding | Description | Associated Conditions |
|---|---|---|
| Decreased breath sounds | Reduced or absent air entry over affected area | Pneumothorax, large pleural effusion, severe bronchospasm, obesity |
| Crackles (rales) | Fine inspiratory crackles, often bibasilar | Pulmonary edema (heart failure), pneumonia, interstitial lung disease |
| Wheezes | High-pitched musical sounds, usually expiratory | Asthma, chronic obstructive pulmonary disease, cardiac asthma (heart failure) |
| Pleural friction rub | Creaking, grating sound synchronous with respiration | Pleuritis, pulmonary embolism with infarction, pneumonia |
| Bronchial breath sounds | Loud, tubular sounds heard over peripheral lung fields | Consolidation (pneumonia), lung collapse with patent airway |
Abdominal Examination
- Epigastric tenderness: Gastritis, peptic ulcer disease, pancreatitis — can present as “chest pain”
- Right upper quadrant tenderness: Biliary disease may cause right-sided chest pain
- Hepatomegaly and hepatojugular reflux: Right heart failure, tricuspid regurgitation
- Pulsatile abdominal mass: Abdominal aortic aneurysm — consider concurrent thoracic aortic pathology
- Ascites: May indicate heart failure, liver disease
Extremities Examination
- Peripheral edema: Bilateral suggests heart failure, hypoalbuminemia; unilateral suggests deep vein thrombosis (pulmonary embolism risk)
- Calf tenderness and swelling: Homan sign (unreliable); unilateral calf swelling with chest pain highly suggestive of deep vein thrombosis with pulmonary embolism
- Clubbing: Lung cancer, chronic hypoxic lung disease, endocarditis, cyanotic heart disease
- Cyanosis: Peripheral (cool extremities, poor perfusion) versus central (tongue, lips — indicates hypoxemia)
- Pulse deficits: Absent or diminished pulses in aortic dissection; radial-femoral delay in coarctation
- Splinter hemorrhages and Janeway lesions: Endocarditis
Specific Chest Wall Examination
| Finding | Examination Technique | Clinical Significance |
|---|---|---|
| Costochondral tenderness | Palpate each costochondral junction systematically; apply gentle pressure | Tenderness at one or more junctions suggests costochondritis (Tietze syndrome if swelling present). Caution: 5-10% of patients with acute coronary syndrome have chest wall tenderness. |
| Reproducible pain with arm movement | Have patient move arm across chest, above head, behind back | Reproduction of pain suggests musculoskeletal cause |
| Dermatomal rash | Inspect entire chest wall including lateral and posterior surfaces | Vesicular rash in dermatomal pattern diagnostic of herpes zoster; pain may precede rash by 2-3 days |
| Point tenderness over ribs | Palpate rib cage; apply compression anteroposteriorly | Rib fracture (trauma, coughing, pathological) |
Expected Findings by Etiology
| Condition | Vital Signs | Cardiovascular | Respiratory | Other Findings |
|---|---|---|---|---|
| Acute coronary syndrome | Tachycardia, hypertension or hypotension, normal oxygen saturation initially | S4 gallop, new murmur if complication; often normal | May have crackles if heart failure develops | Diaphoresis, pallor, Levine sign |
| Aortic dissection | Severe hypertension or hypotension, blood pressure differential between arms | Aortic regurgitation murmur, pulse deficits | Usually normal unless hemothorax | Neurological deficits if cerebral involvement; malperfusion signs |
| Pulmonary embolism | Tachycardia, tachypnea, hypoxia; hypotension if massive | Elevated jugular venous pressure, right ventricular heave, loud P2 | Often normal; pleural rub if pulmonary infarction | Unilateral leg swelling, calf tenderness |
| Tension pneumothorax | Tachycardia, hypotension, hypoxia, tachypnea | Elevated jugular venous pressure, tracheal deviation away | Absent breath sounds, hyperresonance on affected side | Subcutaneous emphysema; clinical diagnosis — do not delay treatment for imaging |
| Pericarditis | May have low-grade fever, tachycardia | Pericardial friction rub (pathognomonic but evanescent) | Usually normal | Pain relieved by sitting forward |
| Cardiac tamponade | Tachycardia, hypotension, pulsus paradoxus (greater than 10 mmHg drop in systolic blood pressure with inspiration) | Elevated jugular venous pressure, muffled heart sounds (Beck’s triad with hypotension) | Usually normal | Kussmaul sign may be present |
| Costochondritis | Normal | Normal | Normal | Reproducible chest wall tenderness; may have localized swelling |
| Gastroesophageal reflux disease | Normal | Normal | Normal | Epigastric tenderness possible; examination usually unremarkable |
Important Teaching Point
Normal examination is common! Many causes of chest pain present with entirely normal physical examination findings. This includes:
- Stable angina: Typically normal examination between episodes
- Early acute coronary syndrome: May have no abnormal findings initially
- Gastroesophageal reflux disease: Usually normal examination
- Esophageal spasm: Normal examination
- Small pulmonary embolism: May have only tachycardia
- Panic disorder: Normal examination (diagnosis of exclusion)
A normal physical examination does not exclude life-threatening pathology. Clinical decision-making must integrate history, risk factors, and appropriate investigations.
Caution: Chest Wall Tenderness
While reproducible chest wall tenderness suggests a musculoskeletal etiology, studies have shown that 5% to 15% of patients with confirmed acute coronary syndrome have chest wall tenderness on examination. Do not use this finding alone to exclude cardiac causes in patients with concerning history or risk factors.
5. Differential Diagnosis
Systematic approach organized by probability and clinical features
Acute Chest Pain (Duration: Less than 1 week)
| Probability | Condition | Key Features | Red Flags |
|---|---|---|---|
| COMMON (approximately 60-70%) | Musculoskeletal pain | Sharp, localized, reproducible with palpation or movement, no associated symptoms | None typically; but do not assume musculoskeletal without risk assessment |
| Acute coronary syndrome | Substernal pressure, radiation to arm/jaw/neck, diaphoresis, nausea, dyspnea; risk factors present | New onset at rest, crescendo pattern, associated hemodynamic instability | |
| Gastroesophageal reflux disease | Burning substernal pain, worse postprandially and supine, associated with regurgitation | Dysphagia, weight loss, gastrointestinal bleeding (suggests malignancy or stricture) | |
| Anxiety and panic disorder | Associated with hyperventilation, palpitations, paresthesias, situational triggers, sense of doom | Diagnosis of exclusion — always rule out organic causes first | |
| LESS COMMON (approximately 20-30%) | Pneumonia | Pleuritic pain, cough, fever, dyspnea, sputum production | High fever, hypoxia, hemodynamic instability, immunocompromise |
| Pulmonary embolism | Pleuritic pain, dyspnea, tachycardia; risk factors (immobility, surgery, malignancy, hormones) | Hypotension, syncope, severe hypoxia (suggests massive pulmonary embolism) | |
| Pericarditis | Sharp pleuritic pain, worse supine, relieved leaning forward; recent viral illness; friction rub | Hemodynamic instability (suggests tamponade), elevated troponin (myopericarditis) | |
| Pneumothorax | Sudden onset pleuritic pain, dyspnea; tall thin habitus, history of lung disease or trauma | Hypotension, tracheal deviation, absent breath sounds (tension pneumothorax — clinical emergency) | |
| UNCOMMON BUT SERIOUS (approximately 5-10%) | Aortic dissection | Sudden severe “tearing” pain radiating to back, maximal at onset; hypertension, Marfan syndrome | Pulse differential, neurological deficits, aortic regurgitation murmur, malperfusion |
| Esophageal rupture (Boerhaave syndrome) | Severe pain following forceful vomiting, subcutaneous emphysema, mediastinal crunch | Sepsis, shock — rapidly fatal if not recognized and treated urgently | |
| Cardiac tamponade | Dyspnea, muffled heart sounds, elevated jugular venous pressure, hypotension (Beck’s triad) | Pulsus paradoxus, electrical alternans on ECG — requires emergent pericardiocentesis | |
| Acute aortic syndrome (intramural hematoma, penetrating ulcer) | Similar to dissection; may present without classic tearing quality | Same as aortic dissection — imaging required for differentiation |
Chronic Chest Pain (Duration: Greater than 4 weeks)
Step-by-Step Approach to Chronic Chest Pain:
- Step 1: Assess cardiovascular risk — Is this stable angina? Calculate pretest probability using age, sex, and symptom characteristics
- Step 2: Consider the “Big Four” non-cardiac causes — Gastroesophageal reflux disease, musculoskeletal pain, anxiety/panic disorder, and esophageal dysmotility account for the majority of chronic chest pain
- Step 3: Review medications — Could this be drug-induced?
- Step 4: Consider less common causes if initial workup negative — pulmonary hypertension, coronary microvascular disease, malignancy
| Probability | Condition | Approximate Frequency | Key Distinguishing Features |
|---|---|---|---|
| COMMON | Gastroesophageal reflux disease | 10-20% of chronic chest pain | Burning quality, postprandial, nocturnal, responds to proton pump inhibitors |
| Musculoskeletal pain (costochondritis, myofascial) | 30-50% in primary care | Reproducible tenderness, related to movement or posture, no systemic symptoms | |
| Stable angina pectoris | 10-15% of cardiac evaluations | Predictable exertional symptoms, relieved by rest within minutes, responds to nitrates | |
| Anxiety and panic disorder | 5-10% of chest pain presentations | Associated psychological symptoms, situational triggers, hyperventilation, diagnosis of exclusion | |
| LESS COMMON | Esophageal dysmotility (spasm, nutcracker esophagus) | 2-5% | May mimic angina precisely, triggered by swallowing or temperature extremes, may respond to nitrates |
| Peptic ulcer disease | 2-5% | Epigastric pain radiating to chest, related to meals, history of Helicobacter pylori or nonsteroidal anti-inflammatory drug use | |
| Biliary disease | 1-3% | Right upper quadrant or epigastric pain radiating to right chest or scapula, postprandial (fatty meals) | |
| Chronic pericarditis or pericardial disease | Less than 1% | Recurrent pleuritic pain, history of acute pericarditis, may have constrictive features | |
| UNCOMMON BUT IMPORTANT | Coronary microvascular disease (cardiac syndrome X) | Variable; more common in women | Angina-like symptoms with normal coronary arteries on angiography; abnormal coronary flow reserve |
| Pulmonary hypertension | Less than 1% | Exertional chest pain and dyspnea, loud P2, right heart failure signs | |
| Lung malignancy | Less than 1% (but critical not to miss) | Smoker, weight loss, hemoptysis, persistent cough, Pancoast tumor (shoulder pain) | |
| Thoracic outlet syndrome | Rare | Arm symptoms with overhead activity, positional, neurological or vascular compromise |
Anatomical Approach to Chest Pain
Cardiac
Acute coronary syndrome
Stable angina pectoris
Pericarditis
Myocarditis
Cardiac tamponade
Aortic stenosis
Hypertrophic cardiomyopathy
Vascular
Aortic dissection
Aortic aneurysm
Pulmonary embolism
Pulmonary hypertension
Intramural hematoma
Penetrating aortic ulcer
Pulmonary
Pneumonia
Pleuritis
Pneumothorax
Lung malignancy
Pleural effusion
Pulmonary infarction
Gastrointestinal
Gastroesophageal reflux disease
Esophageal spasm
Esophagitis
Esophageal rupture
Peptic ulcer disease
Biliary disease
Pancreatitis
Musculoskeletal
- Costochondritis (Tietze syndrome)
- Rib fracture
- Muscle strain
- Cervical or thoracic radiculopathy
- Sternoclavicular arthritis
- Fibromyalgia
Other
- Herpes zoster (shingles)
- Panic disorder and anxiety
- Somatoform disorder
- Breast pathology
- Mediastinitis
- Thoracic outlet syndrome
Drug-Induced Chest Pain
| Drug or Drug Class | Mechanism | Characteristics | Management |
|---|---|---|---|
| Cocaine | Coronary vasoconstriction, accelerated atherosclerosis, increased myocardial oxygen demand, thrombosis | Can cause myocardial infarction in young patients without traditional risk factors; may present hours after use | Avoid beta-blockers (unopposed alpha stimulation); use benzodiazepines, nitrates, calcium channel blockers |
| Amphetamines and methamphetamine | Sympathomimetic effects, tachycardia, hypertension, coronary spasm, cardiomyopathy | Similar to cocaine; associated with cardiomyopathy with chronic use | Supportive care, benzodiazepines; avoid beta-blockers |
| Cannabis | Increased myocardial oxygen demand, possible coronary vasoconstriction | Rare; associated with acute coronary syndrome in case reports, especially with heavy use | Standard acute coronary syndrome management if indicated |
| Nonsteroidal anti-inflammatory drugs | Increased cardiovascular risk (thrombosis, hypertension), gastrointestinal ulceration causing referred pain | Chronic use increases myocardial infarction risk; may cause peptic ulcer disease presenting as chest pain | Discontinue if possible; use lowest effective dose for shortest duration |
| Fluoroquinolones | Aortic aneurysm and dissection risk (collagen disruption) | Increased risk of aortic events; avoid in patients with known aortic disease or risk factors | Alternative antibiotics; monitor for aortic symptoms |
| 5-Fluorouracil and capecitabine | Coronary vasospasm | Can cause severe chest pain and myocardial infarction during chemotherapy | Discontinue therapy; cardiology consultation; consider alternative regimens |
| Triptans | Coronary vasoconstriction (rare) | Contraindicated in coronary artery disease; may cause chest tightness (usually not ischemic) | Avoid in patients with cardiovascular disease; “triptan sensations” usually benign |
| Bisphosphonates | Esophageal irritation and ulceration | Retrosternal burning, especially if taken incorrectly (lying down, insufficient water) | Take with full glass of water, remain upright for 30 minutes; consider IV formulation |
| Potassium supplements | Esophageal ulceration if tablet lodges | Severe retrosternal pain, odynophagia | Take with adequate water and upright position; consider liquid formulation |
Quick Reference: “If You See This, Think This”
| Clinical Clue | Think This First | Next Step |
|---|---|---|
| Substernal pressure with diaphoresis and nausea | Acute coronary syndrome | ECG within 10 minutes, troponin, activate chest pain pathway |
| Sudden “tearing” pain radiating to back | Aortic dissection | Check blood pressure in both arms, urgent CT angiography or transesophageal echocardiography |
| Pleuritic pain with dyspnea and unilateral leg swelling | Pulmonary embolism with deep vein thrombosis | Calculate Wells score, D-dimer or CT pulmonary angiography |
| Sharp pain worse supine, better leaning forward | Pericarditis | ECG (diffuse ST elevation, PR depression), echocardiogram, inflammatory markers |
| Sudden pleuritic pain with absent breath sounds | Pneumothorax | Chest X-ray (if stable); if tension suspected, immediate needle decompression |
| Young patient with cocaine use and chest pain | Cocaine-induced coronary vasospasm or myocardial infarction | ECG, troponin; avoid beta-blockers; benzodiazepines and nitrates first-line |
| Pain reproducible with chest wall palpation | Musculoskeletal pain (costochondritis) | Clinical diagnosis; but remember 5-15% of acute coronary syndrome has chest wall tenderness |
| Burning pain worse after meals and lying down | Gastroesophageal reflux disease | Trial of proton pump inhibitor; endoscopy if alarm features present |
| Exertional pain relieved by rest within minutes | Stable angina | Exercise stress testing or functional imaging; cardiology referral |
| Dermatomal pain with vesicular rash | Herpes zoster | Antiviral therapy within 72 hours of rash onset; pain management |
| Severe pain after forceful vomiting with subcutaneous emphysema | Esophageal rupture (Boerhaave syndrome) | Urgent CT with oral contrast, surgical consultation — high mortality if delayed |
| Muffled heart sounds, elevated jugular venous pressure, hypotension | Cardiac tamponade (Beck’s triad) | Emergent echocardiogram and pericardiocentesis |
6. Diagnostic Investigations
A stepwise, cost-effective approach guided by clinical suspicion
Baseline Investigations for All Patients with Acute Chest Pain
| Investigation | Purpose | What to Look For | Practical Points |
|---|---|---|---|
| 12-Lead ECG | Detect myocardial ischemia, arrhythmia, pericarditis, pulmonary embolism signs | ST elevation or depression, T-wave changes, new Q waves, new left bundle branch block, diffuse ST changes (pericarditis), S1Q3T3 pattern (pulmonary embolism), low voltage (effusion) | Obtain within 10 minutes of presentation; compare with prior ECG if available; serial ECGs if initial is non-diagnostic and suspicion remains high |
| Troponin (high-sensitivity preferred) | Detect myocardial injury | Elevated levels indicate myocardial damage; rising pattern suggests acute injury; high-sensitivity troponin detects smaller infarcts | Serial measurements at 0 and 3 hours (or 0 and 1 hour with high-sensitivity assays); elevated troponin does not equal acute coronary syndrome — consider other causes (pulmonary embolism, myocarditis, sepsis, renal failure) |
| Chest X-ray | Detect pulmonary pathology, cardiomegaly, mediastinal widening, pneumothorax | Widened mediastinum (aortic dissection), cardiomegaly, pulmonary edema, infiltrates, pneumothorax, rib fractures, pleural effusion | Portable chest X-ray acceptable initially; may be normal in acute coronary syndrome, pulmonary embolism, and early aortic dissection |
| Complete blood count | Detect anemia, infection, thrombocytopenia | Anemia (may precipitate type 2 myocardial infarction), leukocytosis (infection, stress response), thrombocytopenia (disseminated intravascular coagulation, heparin-induced) | Hemoglobin less than 8 g/dL can cause demand ischemia |
| Basic metabolic panel | Assess renal function, electrolytes | Renal dysfunction (affects drug dosing, contrast decisions), electrolyte abnormalities (arrhythmia risk) | Creatinine important before contrast studies or certain medications |
| Coagulation studies (PT/INR, aPTT) | Baseline before anticoagulation, assess bleeding risk | Prolonged values suggest coagulopathy; important if considering thrombolysis or anticoagulation | Essential before invasive procedures |
Targeted Investigations by Suspected Etiology
If Suspecting Acute Coronary Syndrome
First-Line Tests
- Serial ECGs: Repeat every 15-30 minutes if initial ECG non-diagnostic and clinical suspicion high; look for dynamic changes
- Serial high-sensitivity troponin: 0-hour and 1-hour or 3-hour protocol depending on assay; rule-out with two negative values and low clinical probability
- Echocardiogram: Assess regional wall motion abnormalities; helps when ECG non-diagnostic
Second-Line and Definitive Tests
- Coronary angiography: Gold standard for diagnosis; indicated urgently for ST-elevation myocardial infarction and high-risk non-ST-elevation acute coronary syndrome
- CT coronary angiography: Useful for low-to-intermediate risk patients; high negative predictive value to rule out coronary artery disease
- Stress testing: For stable patients after acute coronary syndrome ruled out; exercise or pharmacological with imaging
If Suspecting Pulmonary Embolism
Risk Stratification First
- Wells score or revised Geneva score: Calculate pretest probability before ordering tests
- PERC rule: If all 8 criteria met in low-risk patients, pulmonary embolism effectively ruled out without further testing
- D-dimer: Use age-adjusted cutoff (age × 10 μg/L for patients over 50); high sensitivity but low specificity; useful to rule out in low-to-moderate pretest probability
Imaging
- CT pulmonary angiography: Test of choice; highly sensitive and specific; can assess right ventricular strain
- Ventilation-perfusion scan: Alternative if contrast contraindicated or in pregnancy (lower radiation to breast tissue)
- Lower extremity Doppler ultrasound: If deep vein thrombosis found, can treat without CT pulmonary angiography in stable patients
- Echocardiogram: Assess right ventricular strain in massive or submassive pulmonary embolism; McConnell sign (right ventricular free wall hypokinesis with apical sparing)
If Suspecting Aortic Dissection
Imaging (Urgent)
- CT angiography of aorta: Test of choice; highly sensitive and specific; defines extent and involvement of branch vessels
- Transesophageal echocardiography: Alternative when CT not available or patient unstable; can be performed at bedside or in operating room
- MR angiography: Excellent accuracy but limited by time and availability; not first-line for acute presentations
Supportive Tests
- Chest X-ray: Widened mediastinum in approximately 60% (absence does not exclude dissection)
- D-dimer: Elevated in acute aortic syndrome; may help rule out if very low, but not validated for this purpose
- Blood pressure in both arms: Differential greater than 20 mmHg systolic supports diagnosis
- Renal function and lactate: Assess for malperfusion
If Suspecting Pericarditis
First-Line Tests
- ECG: Diffuse ST elevation (concave up), PR depression (especially in lead II), PR elevation in aVR; absence does not exclude diagnosis
- Inflammatory markers: Elevated erythrocyte sedimentation rate, C-reactive protein support diagnosis; help monitor treatment response
- Troponin: May be elevated in myopericarditis; does not change management unless significant
Second-Line Tests
- Echocardiogram: Assess for pericardial effusion; evaluate for tamponade physiology if present
- Chest X-ray: Usually normal unless large effusion (“water bottle” heart)
- CT or MRI: If concern for purulent pericarditis, malignancy, or constrictive features
- Pericardiocentesis: If large effusion or tamponade; send for cytology, culture, protein, lactate dehydrogenase
If Suspecting Pneumothorax
Imaging
- Chest X-ray (erect, inspiratory): First-line; look for visceral pleural line, absent lung markings beyond the line
- CT chest: More sensitive for small pneumothorax; useful for underlying lung disease assessment
- Point-of-care ultrasound: Absence of lung sliding and B-lines; presence of lung point is diagnostic
Important Notes
- Tension pneumothorax is a clinical diagnosis: Do not delay treatment for imaging if patient is unstable
- Expiratory films: No longer routinely recommended; do not significantly improve detection
- Supine films: May miss pneumothorax; look for deep sulcus sign
If Suspecting Gastroesophageal Reflux Disease or Esophageal Pathology
First-Line Approach
- Empiric proton pump inhibitor trial: 4 to 8 week trial of twice-daily proton pump inhibitor; response supports diagnosis
- Symptom correlation: Ask about meal timing, position, regurgitation
Second-Line Tests
- Upper endoscopy: If alarm features (dysphagia, weight loss, gastrointestinal bleeding, age greater than 60 with new symptoms)
- 24-hour pH monitoring: Gold standard for diagnosing pathological reflux; correlates symptoms with acid exposure
- Esophageal manometry: If esophageal dysmotility or spasm suspected
Empiric Treatment Trials as Diagnostic Tools
Sequential Empiric Therapy Approach for Non-Cardiac Chest Pain
When cardiac causes have been excluded and the diagnosis remains uncertain, empiric treatment trials can serve as diagnostic tools. Response to therapy supports the diagnosis.
- Proton pump inhibitor trial: Omeprazole 20-40 mg twice daily for 4 to 8 weeks — tests for gastroesophageal reflux disease; 80% sensitive if positive response
- Anti-inflammatory trial: Nonsteroidal anti-inflammatory drugs for 1 to 2 weeks — tests for musculoskeletal and inflammatory causes (use with caution in cardiovascular disease)
- Anxiolytic or cognitive behavioral therapy trial: If panic disorder suspected after organic causes excluded — response supports diagnosis
Clinical Risk Stratification Tools
| Tool | Purpose | Components | Interpretation |
|---|---|---|---|
| HEART Score | Risk stratification for acute coronary syndrome in emergency department | History, ECG, Age, Risk factors, Troponin (0-2 points each) | Score 0-3: low risk (less than 2% major adverse cardiac event); 4-6: intermediate; 7-10: high risk |
| TIMI Risk Score | Prognosis in non-ST-elevation acute coronary syndrome | Age 65 or older, 3 or more risk factors, known coronary artery disease, aspirin use, 2 or more anginal episodes in 24 hours, ST changes, elevated troponin | Higher score indicates higher 14-day risk of death, myocardial infarction, or need for revascularization |
| Wells Score for Pulmonary Embolism | Pretest probability for pulmonary embolism | Clinical signs of deep vein thrombosis, pulmonary embolism most likely diagnosis, heart rate greater than 100, immobilization or surgery, previous deep vein thrombosis or pulmonary embolism, hemoptysis, malignancy | Low probability: less than 2; Moderate: 2-6; High: greater than 6; guides D-dimer or imaging decision |
| PERC Rule | Rule out pulmonary embolism without testing in low-risk patients | Age less than 50, heart rate less than 100, oxygen saturation 95% or greater, no hemoptysis, no estrogen use, no prior deep vein thrombosis or pulmonary embolism, no unilateral leg swelling, no surgery or trauma in past 4 weeks | If all criteria met and low clinical suspicion, pulmonary embolism effectively ruled out |
| Aortic Dissection Detection Risk Score | Identify patients needing urgent imaging for aortic dissection | High-risk conditions (Marfan, family history, known aortic disease), high-risk pain features (sudden, severe, tearing), high-risk examination findings (pulse deficit, blood pressure differential, new aortic regurgitation, hypotension) | Score 0: low risk; 1 or more: consider urgent imaging; does not rule out dissection |
Important: Normal Initial Investigations Do Not Exclude Serious Pathology
- Normal ECG: Does not exclude acute coronary syndrome; up to 6% of patients with myocardial infarction have normal initial ECG
- Normal initial troponin: May be negative early; requires serial measurement; high-sensitivity assays improve early detection
- Normal chest X-ray: Does not exclude aortic dissection, pulmonary embolism, or early pneumonia
- Normal D-dimer: Useful only in low-to-moderate pretest probability; not helpful if high clinical suspicion
Clinical judgment must integrate history, examination, and investigation results. If clinical suspicion remains high despite negative initial tests, pursue further evaluation or observation.
7. Pattern Recognition and Clinical Decision-Making
Practical algorithms and decision pathways
Step 1: Is This Urgent?
| Clinical Scenario | Urgency Level | Immediate Action |
|---|---|---|
| ST-elevation myocardial infarction on ECG | EMERGENT | Activate cardiac catheterization laboratory; door-to-balloon time less than 90 minutes; aspirin, anticoagulation, consider thrombolysis if percutaneous coronary intervention not available |
| Hypotension with chest pain (cardiogenic shock, massive pulmonary embolism, tamponade) | EMERGENT | Intravenous access, fluid resuscitation (cautious if cardiac), vasopressors, urgent echocardiogram, prepare for intervention |
| Tension pneumothorax (absent breath sounds, tracheal deviation, hypotension) | EMERGENT | Immediate needle decompression (2nd intercostal space, midclavicular line) followed by chest tube; do not wait for imaging |
| Suspected aortic dissection (tearing pain, blood pressure differential, pulse deficit) | EMERGENT | Urgent CT angiography or transesophageal echocardiography; blood pressure control (target systolic less than 120 mmHg); heart rate control (target less than 60); surgical consultation |
| Non-ST-elevation acute coronary syndrome with ongoing pain, dynamic ECG changes, or hemodynamic instability | URGENT | Admit to monitored bed; dual antiplatelet therapy, anticoagulation; early invasive strategy (angiography within 24 hours) |
| Pulmonary embolism with right ventricular strain (submassive) | URGENT | Anticoagulation; consider thrombolysis or catheter-directed therapy if deteriorating; intensive care unit monitoring |
| Pericarditis with large effusion or early tamponade features | URGENT | Echocardiogram; prepare for pericardiocentesis if tamponade physiology; cardiology consultation |
| Stable chest pain with low-risk features, normal ECG, negative initial troponin | ROUTINE | Serial troponin; observation; consider accelerated diagnostic protocol or outpatient stress testing |
| Clearly musculoskeletal pain in young patient with no risk factors | ROUTINE | Clinical diagnosis; reassurance; analgesia; safety-net advice to return if symptoms change |
Step 2: Classify by Clinical Presentation
Acute Presentation (less than 1 week)
Priority: Exclude life-threatening causes
Proceed to Algorithm A
Recurrent or Exertional Pattern
Priority: Assess for stable coronary artery disease
Proceed to Algorithm B
Chronic Non-Cardiac Features
Priority: Identify gastrointestinal, musculoskeletal, or psychological cause
Proceed to Algorithm C
Step 3: Follow the Appropriate Algorithm
Algorithm A: Acute Chest Pain Evaluation
| Clinical Scenario | Most Likely Diagnosis | Action |
|---|---|---|
| ST elevation on ECG in appropriate clinical context | ST-elevation myocardial infarction | Activate catheterization laboratory; aspirin 300 mg, anticoagulation; primary percutaneous coronary intervention or thrombolysis |
| Elevated troponin with ischemic symptoms but no ST elevation | Non-ST-elevation myocardial infarction | Admit; dual antiplatelet therapy; anticoagulation; risk stratify for timing of angiography |
| Ischemic symptoms, normal ECG, negative serial troponins | Unstable angina or non-cardiac | Calculate HEART score; if low risk, consider discharge with outpatient stress testing; if intermediate, observe or stress testing before discharge |
| High pretest probability for pulmonary embolism or positive D-dimer | Pulmonary embolism | CT pulmonary angiography; if positive, anticoagulate; if negative and low clinical suspicion, pulmonary embolism excluded |
| Sudden tearing pain to back, blood pressure or pulse differential | Aortic dissection | Urgent CT aorta; blood pressure and heart rate control; surgical consultation for Type A dissection |
| Pleuritic pain, diffuse ST elevation, PR depression | Acute pericarditis | Echocardiogram to assess effusion; nonsteroidal anti-inflammatory drugs plus colchicine; monitor for tamponade |
| Sudden dyspnea, absent breath sounds, hyperresonance | Pneumothorax | Chest X-ray (if stable); needle decompression if tension; chest tube for large or symptomatic pneumothorax |
Algorithm B: Stable Exertional Chest Pain Evaluation
| Clinical Scenario | Assessment | Action |
|---|---|---|
| Typical angina (substernal, exertional, relieved by rest or nitrates) in patient with multiple risk factors | High pretest probability for coronary artery disease | Consider direct referral for coronary angiography or functional imaging (stress echocardiography, nuclear perfusion, stress MRI) |
| Atypical angina (2 of 3 typical features) with moderate risk factors | Intermediate pretest probability | Functional stress testing (exercise ECG if able to exercise and interpretable ECG) or CT coronary angiography |
| Non-anginal pain (1 or fewer typical features) in low-risk patient | Low pretest probability | Consider non-cardiac causes first; if testing needed, CT coronary angiography has high negative predictive value |
| Known coronary artery disease with change in symptom pattern | Possible unstable angina or progression | Lower threshold for admission and evaluation; compare to previous angiography; cardiology consultation |
Algorithm C: Chronic Non-Cardiac Chest Pain
| Clinical Scenario | Most Likely Diagnosis | Action |
|---|---|---|
| Burning substernal pain, worse postprandially and supine, regurgitation symptoms | Gastroesophageal reflux disease | Empiric proton pump inhibitor trial (twice daily for 4-8 weeks); endoscopy if alarm features or no response |
| Substernal pain triggered by swallowing, hot or cold foods | Esophageal dysmotility | Trial of proton pump inhibitor first; if no response, esophageal manometry; consider calcium channel blockers or tricyclic antidepressants |
| Localized chest wall pain reproducible with palpation, related to movement | Costochondritis or musculoskeletal pain | Reassurance; nonsteroidal anti-inflammatory drugs; physical therapy if persistent; exclude if any cardiac risk factors |
| Pain associated with anxiety, palpitations, hyperventilation, no organic cause identified | Panic disorder or anxiety | Diagnosis of exclusion; validate symptoms; cognitive behavioral therapy; consider selective serotonin reuptake inhibitor if recurrent |
| Dermatomal pain with or without rash | Herpes zoster | Antiviral therapy if within 72 hours of rash; pain management; watch for postherpetic neuralgia |
“What Do I Do If…” Decision Reference
| Clinical Situation | Immediate Action | Next Step |
|---|---|---|
| Patient has chest pain and takes a phosphodiesterase-5 inhibitor (sildenafil, tadalafil) | Do NOT give nitrates (risk of severe hypotension) | Wait 24 hours (sildenafil) or 48 hours (tadalafil) before nitrate administration; use alternative antianginals |
| Young patient with chest pain after cocaine use | ECG, troponin; benzodiazepines for agitation and blood pressure | Avoid beta-blockers (risk of unopposed alpha stimulation); use nitrates, calcium channel blockers; consider angiography if ST elevation |
| Troponin mildly elevated but ECG and clinical picture suggest non-cardiac cause | Consider causes of troponin elevation without acute coronary syndrome | Type 2 myocardial infarction (demand ischemia), myocarditis, pulmonary embolism, sepsis, renal failure, takotsubo cardiomyopathy; treat underlying cause |
| ECG shows new left bundle branch block with chest pain | Treat as ST-elevation myocardial infarction equivalent if clinical suspicion high | Activate catheterization laboratory; use Sgarbossa criteria to help identify acute myocardial infarction in left bundle branch block |
| Patient presents with chest pain but recent normal stress test | Reassess symptom quality; still consider acute coronary syndrome if presentation concerning | Normal stress test reduces but does not eliminate risk; plaque rupture can occur in non-obstructive lesions; obtain ECG and troponin |
| Chest pain with pericardial effusion but no tamponade | Treat underlying pericarditis; monitor closely | Serial echocardiograms; admit if moderate-large effusion; urgent drainage only if tamponade develops |
| High clinical suspicion for pulmonary embolism but patient has contrast allergy | Consider ventilation-perfusion scan instead of CT pulmonary angiography | Alternatively, steroid premedication protocol if CT essential; lower extremity Doppler can confirm deep vein thrombosis allowing treatment without CT |
| Chest pain in pregnant patient | Pregnancy increases risk of pulmonary embolism and aortic dissection; do not dismiss symptoms | D-dimer less useful (often elevated in pregnancy); low-dose CT pulmonary angiography or ventilation-perfusion scan acceptable; echocardiogram safe first-line for cardiac assessment |
Troubleshooting Refractory or Unexplained Chest Pain
When Initial Workup Is Negative But Symptoms Persist, Ask These Questions:
- Was the diagnosis correct? Reconsider the differential; could this be coronary microvascular disease, esophageal hypersensitivity, or chest wall syndrome?
- Were all cardiac causes adequately excluded? Consider functional testing if only anatomical imaging done; consider coronary angiography if non-invasive testing inconclusive
- Has gastroesophageal reflux disease been adequately treated? Ensure adequate proton pump inhibitor dosing (twice daily) and duration (8 weeks); consider pH monitoring if no response
- Could there be multiple overlapping causes? Patients often have more than one contributor to chest pain
- Is there a psychological component? Anxiety and panic disorder are common; cognitive behavioral therapy can be effective
- Was patient adherence adequate? Verify medication compliance and correct technique
- Should specialist referral be considered? Gastroenterology, cardiology, or pain medicine may offer additional evaluation and management options
8. Clinical Pearls and Pitfalls
Practical wisdom — learn from successes and avoid common mistakes
Must-Know Clinical Pearls
The “Big Five” must always be considered: In any acute chest pain presentation, systematically exclude acute coronary syndrome, aortic dissection, pulmonary embolism, tension pneumothorax, and esophageal rupture before attributing pain to benign causes.
ECG within 10 minutes: Every patient presenting with acute chest pain should have an ECG performed and interpreted within 10 minutes of arrival. This is a critical quality metric that saves lives in ST-elevation myocardial infarction.
Atypical presentations are common in certain groups: Women, elderly patients, and those with diabetes often present without classic substernal pressure. Dyspnea, fatigue, nausea, and back pain may be the only symptoms of acute coronary syndrome. Maintain a low threshold for investigation in these populations.
Serial troponins are essential: A single negative troponin does not rule out acute coronary syndrome. High-sensitivity troponin with 0 and 1-hour or 0 and 3-hour protocols allows safe early rule-out in appropriate patients.
Aortic dissection is the great mimicker: Dissection can present as stroke, myocardial infarction, acute limb ischemia, or abdominal pain depending on which branches are involved. Always consider it when chest pain is sudden, severe, and maximal at onset.
Check blood pressure in both arms: A systolic difference greater than 20 mmHg is a red flag for aortic dissection. This simple bedside test can be life-saving and is often omitted.
Pericarditis pain has a characteristic posture: Patients with pericarditis often sit forward and resist lying flat. The pain is typically sharp, pleuritic, and relieved by leaning forward — this history is highly suggestive.
Pulmonary embolism often presents atypically: Dyspnea may be the only symptom. Tachycardia, hypoxia, and pleuritic pain are classic but not always present. Calculate pretest probability before ordering tests.
Critical Pitfalls to Avoid
Assuming chest wall tenderness excludes cardiac disease: Studies show 5-15% of patients with confirmed acute coronary syndrome have reproducible chest wall tenderness. Never use this finding alone to exclude a cardiac cause in a patient with risk factors or concerning history.
Giving nitrates to patients on phosphodiesterase-5 inhibitors: Sildenafil, tadalafil, and vardenafil cause severe, potentially fatal hypotension when combined with nitrates. Always ask about erectile dysfunction medications before administering nitrates.
Using beta-blockers in cocaine-associated chest pain: Beta-blockers cause unopposed alpha-adrenergic stimulation in cocaine toxicity, worsening coronary vasoconstriction and hypertension. Use benzodiazepines, nitrates, and calcium channel blockers instead.
Relying on a normal chest X-ray to exclude aortic dissection: Chest X-ray is normal in up to 20% of aortic dissection cases. A widened mediastinum is suggestive but its absence does not rule out dissection. CT angiography is required if clinical suspicion is present.
Dismissing chest pain in young patients: While less common, acute coronary syndrome, pulmonary embolism, and aortic dissection can occur in young adults, especially with cocaine use, thrombophilia, connective tissue disorders, or strong family history. Risk-stratify appropriately.
Waiting for imaging before treating tension pneumothorax: Tension pneumothorax is a clinical diagnosis. If a patient has absent breath sounds, tracheal deviation, hypotension, and severe respiratory distress, perform immediate needle decompression. Delay for imaging can be fatal.
Assuming elevated troponin always means acute coronary syndrome: Troponin elevation occurs in many conditions including pulmonary embolism, myocarditis, sepsis, renal failure, heart failure exacerbation, and takotsubo cardiomyopathy. Always interpret troponin in clinical context.
Forgetting to compare with prior ECGs: New changes are more significant than static abnormalities. Always compare current ECG with previous tracings when available. A “normal” ECG may actually represent significant change from baseline.
Key Takeaways
- Systematic approach is essential: Always consider the “Big Five” life-threatening causes (acute coronary syndrome, aortic dissection, pulmonary embolism, tension pneumothorax, esophageal rupture) before attributing chest pain to benign etiologies.
- Time is myocardium: In ST-elevation myocardial infarction, every minute of delay to reperfusion results in additional myocardial loss. Aim for ECG within 10 minutes and door-to-balloon time under 90 minutes.
- History guides probability: The character, timing, radiation, and associated symptoms of chest pain significantly influence pretest probability and guide investigation strategy.
- Physical examination can be normal: Many serious causes of chest pain (early acute coronary syndrome, pulmonary embolism, gastroesophageal reflux disease) present with entirely normal physical examination. Do not be falsely reassured.
- Risk stratification tools aid decision-making: Use validated scores (HEART, TIMI, Wells, PERC) to guide investigation and disposition, but never let a score override clinical judgment in a concerning presentation.
- Serial testing improves sensitivity: A single ECG or troponin measurement has limited sensitivity. Serial ECGs and troponins (using appropriate protocols) significantly improve diagnostic accuracy for acute coronary syndrome.
- Consider multiple etiologies: Patients may have more than one cause of chest pain simultaneously. Complete evaluation should address all identified problems.
- Atypical presentations require heightened vigilance: Women, elderly patients, diabetics, and those with psychiatric comorbidity often present atypically. Maintain appropriate suspicion for serious disease despite absence of classic features.
- Document clinical reasoning: Chest pain carries medicolegal implications. Document your differential diagnosis, risk stratification, investigation rationale, and safety-net advice clearly.
- Safety-net advice is critical: Patients discharged with chest pain should receive clear instructions to return immediately if symptoms worsen, recur, or new concerning features develop.
Quick Reference Algorithm
Systematic Approach to Chest Pain:
- Assess stability: Airway, breathing, circulation; identify immediate threats (tension pneumothorax, cardiac arrest, cardiogenic shock)
- Obtain ECG within 10 minutes: Look for ST changes, arrhythmia, signs of right heart strain, pericarditis pattern
- Take focused history: Use “CHEST PAINS” mnemonic; identify red flags; assess risk factors for coronary artery disease, pulmonary embolism, and aortic dissection
- Perform targeted examination: Vital signs including blood pressure in both arms; cardiovascular, respiratory, and chest wall examination
- Order baseline investigations: Troponin, complete blood count, metabolic panel, chest X-ray; D-dimer if pulmonary embolism suspected
- Risk stratify: Calculate HEART score for acute coronary syndrome, Wells score for pulmonary embolism; consider aortic dissection detection risk score
- Pursue targeted investigations: Based on clinical probability — CT pulmonary angiography for pulmonary embolism, CT aortography for dissection, serial troponins and observation for suspected acute coronary syndrome
- Make disposition decision: Admit high-risk patients; observe intermediate risk; consider accelerated diagnostic protocols for low-risk; provide safety-net advice for discharged patients
Final Reference: Distinguishing Features of Major Causes
| Diagnosis | Classic Pain Character | Key Historical Feature | Key Examination Finding | First Test |
|---|---|---|---|---|
| Acute coronary syndrome | Substernal pressure, squeezing | Radiation to arm, jaw; diaphoresis; nausea | Often normal; S4 gallop; signs of heart failure | ECG, troponin |
| Aortic dissection | Tearing, ripping; maximal at onset | Sudden severe onset; radiates to back | Blood pressure differential; pulse deficits; aortic regurgitation | CT angiography |
| Pulmonary embolism | Pleuritic; may be substernal if massive | Dyspnea; risk factors (immobility, surgery, malignancy) | Tachycardia; hypoxia; unilateral leg swelling | Wells score, D-dimer, CT pulmonary angiography |
| Pericarditis | Sharp, pleuritic | Worse supine, better leaning forward; recent viral illness | Pericardial friction rub | ECG (diffuse ST elevation, PR depression) |
| Pneumothorax | Sudden, sharp, pleuritic | Sudden onset; dyspnea; tall thin habitus or lung disease | Absent breath sounds; hyperresonance | Chest X-ray (clinical diagnosis if tension) |
| Gastroesophageal reflux disease | Burning, substernal | Postprandial; worse lying flat; regurgitation | Usually normal | Empiric proton pump inhibitor trial |
| Costochondritis | Sharp, localized | Related to movement; no systemic symptoms | Reproducible tenderness at costochondral junctions | Clinical diagnosis |