Closed-chest trauma in a young man was followed by rupture of a right ventricular papillary muscle and bifascicular block. This produced signs and symptoms of tricuspid regurgitation and recurrent syncope. Treatment by valve replacement and pacemaker implantation was successful. Review of 30 cases of traumatic tricuspid regurgitation reveals that this patient had characteristic findings: adult onset of isolated tricuspid regurgitation, a history of trauma, right bundle branch block, and cardiomegaly without signs of left ventricular failure. In addition, right atrial hypertension of longstanding may produce cyanosis because of right-left shunting through a patent foramen ovale.
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