Which physical exam findings are most indicative of myocardial infarction?

• A. Jugular venous distension, edema, crackles
• B. Hypotension, diaphoresis, S3 gallop
• C. Chest Pain with Radiation to Jaw
• D. Hypertension and Tachycardia

Answer: (B)

The key idea is that acute myocardial infarction often presents with signs of both sympathetic activation and acute pump failure on exam. Diaphoresis and hypotension reflect the body’s stress response and the heart’s diminished ability to maintain blood pressure and perfusion when a significant amount of myocardium is injured. An S3 gallop indicates volume overload and reduced left ventricular contractility that can occur with acute LV dysfunction after an MI. Taken together, these findings point to an acute ischemic event with hemodynamic compromise.

Jugular venous distension with edema and crackles can occur with heart failure, but they are less specific to the acute MI event and reflect established or ongoing heart failure rather than the immediate infarct presentation. Chest pain with radiation to the jaw is a classic symptom, but it’s a history finding rather than a physical exam sign. Hypertension and tachycardia can appear in many contexts and are not as specific to acute MI as the combination of hypotension, diaphoresis, and an S3 gallop.