Evaluation of Chest Pain with Negative Cardiac Biomarkers

Epidemiology of Non‑Cardiac Chest Pain

• When high‑sensitivity cardiac biomarkers are negative, the majority of chest‑pain presentations are due to non‑cardiac etiologies—most commonly musculoskeletal disorders (e.g., costochondritis), gastrointestinal conditions (especially gastro‑esophageal reflux disease), pulmonary diseases (such as pulmonary embolism or pneumonia), and psychological disorders (notably panic disorder)【1】【2】.

Life‑Threatening Conditions That Must Be Excluded First

Aortic Dissection

• Sudden, severe “ripping” chest pain radiating to the back, often accompanied by pulse differentials, occurs preferentially in patients with hypertension, known aortic pathology, or connective‑tissue disease【3】【4】.

Pulmonary Embolism

• >90 % of patients present with tachycardia and dyspnea, and pleuritic chest pain is a typical feature【3】.

Esophageal Rupture (Boerhaave Syndrome)

• Presents with abrupt, severe chest pain and a painful, tympanic abdomen【3】.

Tension Pneumothorax

• Characterized by pleuritic chest pain and unilateral absence of breath sounds on auscultation【3】.

Most Common Non‑Cardiac Causes

Musculoskeletal (Most Frequent)

• Costochondritis or chest‑wall pain—tenderness over costochondral joints or pain that worsens with deep inspiration markedly lowers the pre‑test probability of acute coronary syndrome【3】【1】.
• Muscle strain and rib fractures are frequently linked to recent or occult chest trauma【1】.

Gastrointestinal (≈10–20 % of Cases)

• Gastro‑esophageal reflux disease is the leading GI cause, producing squeezing or burning retrosternal discomfort that lasts minutes to hours and often follows meals or occurs at night【1】.
• Esophageal motility disorders (achalasia, distal esophageal spasm, nutcracker esophagus) cause squeezing retrosternal pain often accompanied by dysphagia【1】.
• Esophagitis—secondary to medications (NSAIDs, potassium, iron, bisphosphonates), infections, or eosinophilic inflammation—can mimic cardiac pain【2】.
• Peptic ulcer disease and gastritis, frequently medication‑related, are additional GI contributors【1】.

Respiratory

• Pneumonia may produce localized pleuritic chest pain and can be associated with a pleural friction rub【3】.
• Pneumothorax presents with pleuritic chest pain and unilateral loss of breath sounds【3】.

Cardiac Causes Despite Negative Biomarkers

• Pericarditis—sharp pain that worsens with inspiration and when supine, often with a pericardial friction rub—can occur with normal troponin levels【3】【4】.
• Severe aortic stenosis may generate angina via coronary microvascular dysfunction even when coronary arteries are angiographically normal【2】.
• Stable angina can present with negative initial troponin if there is no acute myocardial injury【4】.

Clinical Assessment: Key History Elements

• Sharp pain that intensifies with inspiration or when lying supine suggests pericarditis rather than ischemic heart disease【5】【4】.
• Sudden ripping pain radiating to the back raises suspicion for aortic dissection【5】【4】.
• Fleeting pain lasting only seconds is unlikely to be ischemic【5】【4】.
• Pain confined to a very limited area or radiating below the umbilicus is atypical for myocardial ischemia【5】【4】.
• Positional chest pain (worse with certain movements) usually indicates a non‑ischemic musculoskeletal source【5】.
• Burning retrosternal pain after meals or at night points toward gastro‑esophageal reflux disease【1】.

Diagnostic Algorithms for Gastrointestinal Evaluation

• In the absence of alarm symptoms, an empiric trial of acid‑suppression therapy is recommended【2】.
• Presence of alarm features (dysphagia, odynophagia, gastrointestinal bleeding, unexplained iron‑deficiency anemia, weight loss, recurrent vomiting) warrants upper endoscopy【2】.
• If endoscopy is normal and symptoms persist despite acid suppression, esophageal functional testing and ambulatory pH monitoring should be considered【2】.

Important Caveats

• A normal physical examination does not exclude an uncomplicated acute myocardial infarction; serial high‑sensitivity troponin measurements may still be required【3】.
• Relief of chest pain with nitroglycerin is not a reliable diagnostic criterion for myocardial ischemia【5】.
• Palpable chest wall tenderness significantly reduces—but does not eliminate—the likelihood of acute coronary syndrome; clinical context remains essential【3】.