Beck's triad for cardiac tamponade includes jugular venous distension, hypotension, and muffled heart sounds. Which finding is not part of the triad?

• A. Hypotension
• B. Jugular Venous Distension
• C. Muffled Heart Sounds
• D. Widened Pulse Pressure

Answer: (D)

The essential idea is that tamponade from a pericardial effusion compresses the heart, especially during diastole, limiting filling and lowering cardiac output. This produces a sequence: venous blood backs up into the systemic veins, so jugular venous distension appears; reduced filling lowers the systolic blood pressure, causing hypotension; and the heart is encased in fluid, which muffles the heart sounds.

Which finding does not fit this pattern? A widened pulse pressure. In tamponade, the systolic pressure falls with the maintained or relatively less affected diastolic pressure, so the gap between systolic and diastolic pressures is typically narrow, not wide. You may instead see a pulsus paradoxus, reflecting exaggerated inspiratory fall in systolic pressure. For confirmation, bedside ultrasound can show a pericardial effusion with diastolic collapse of the right heart chambers.