Which combination constitutes the three cardinal signs of cardiac tamponade?

Which combination constitutes the three cardinal signs of cardiac tamponade?

• A. Hypertension, muffled heart sounds, JVD
• B. Hypotension, muffled heart sounds, JVD
• C. Hypotension, loud S1, wide pulse pressure
• D. Hypertension, JVD, tachypnea

Answer: (B)

Beck’s triad is being tested here: hypotension, muffled heart sounds, and elevated jugular venous pressure. In cardiac tamponade, fluid in the pericardial sac increases intrapericardial pressure, which sharply limits the heart’s ability to fill during diastole. This reduced filling lowers the stroke volume and cardiac output, so blood pressure drops. The backed-up venous system causes the jugular veins to become distended, reflecting elevated jugular venous pressure. The muffled heart sounds come from the fluid surrounding the heart dampening the sound transmission during auscultation. While other signs like pulsus paradoxus or tachycardia may appear, this trio best captures the classic presentation. The combination of hypotension with muffled heart sounds and JVD aligns with tamponade, whereas the other options include features (like hypertension or a loud S1/wide pulse pressure) that are not typical for tamponade.

Beck’s triad is being tested here: hypotension, muffled heart sounds, and elevated jugular venous pressure. In cardiac tamponade, fluid in the pericardial sac increases intrapericardial pressure, which sharply limits the heart’s ability to fill during diastole. This reduced filling lowers the stroke volume and cardiac output, so blood pressure drops. The backed-up venous system causes the jugular veins to become distended, reflecting elevated jugular venous pressure. The muffled heart sounds come from the fluid surrounding the heart dampening the sound transmission during auscultation. While other signs like pulsus paradoxus or tachycardia may appear, this trio best captures the classic presentation. The combination of hypotension with muffled heart sounds and JVD aligns with tamponade, whereas the other options include features (like hypertension or a loud S1/wide pulse pressure) that are not typical for tamponade.