Which finding should be reported immediately in suspected cardiac tamponade?

• A. Sudden cessation of chest tube drainage
• B. Increased midline chest incisional bleeding
• C. Restlessness
• D. Pulsus paradoxus

Answer: (D)

Pulsus paradoxus signals that the heart’s filling is being severely limited by pressure in the pericardial sac, which is exactly what happens in tamponade. In tamponade, the increased intrapericardial pressure prevents the ventricles from filling properly, so during inspiration venous return rises but stroke volume falls, producing a marked drop in systolic blood pressure with inspiration—this is pulsus paradoxus. It is a direct, clinically urgent sign that hemodynamics are collapsing, so it should be reported immediately to initiate rapid intervention (such as re-exploration or pericardiocentesis) to relieve the tamponade.

While other findings like sudden cessation of chest tube drainage, increased chest incisional bleeding, or restlessness may accompany postoperative issues, they do not specifically indicate evolving tamponade. Sudden chest tube drain cessation could be tube obstruction or other issues; increased bleeding reflects hemorrhage rather than tamponade physiology; restlessness is nonspecific and not diagnostic of tamponade.