Beck's triad is an indicator of which condition?

• A. Myocardial infarction
• B. Cardiac tamponade
• C. Pulmonary edema
• D. Aortic dissection

Answer: (B)

Beck's triad signals cardiac tamponade, a situation where fluid around the heart compresses it and prevents proper filling. The triad—low blood pressure, jugular venous distention, and muffled heart sounds—comes from the heart having less room to fill during diastole. Reduced filling lowers stroke volume and cardiac output, causing hypotension. The backed-up blood elevates the neck veins, and the fluid around the heart muffles the sounds heard with a stethoscope. This pattern is classic for tamponade and helps distinguish it from other conditions like myocardial infarction (which centers on chest pain and ECG changes rather than JVD and muffled sounds), pulmonary edema (dyspnea with crackles and pink sputum), or aortic dissection (sudden, severe chest pain with differential blood pressures). In the field, suspect tamponade when these signs appear, especially after chest trauma or in the setting of known pericardial effusion, and prioritize rapid transport with supportive care.