Abstract
A patient developed acute, severe hemodynamic deterioration five days after an aortic valve replacement. Cardiac catheterization revealed a markedly elevated right atrial pressure but a normal right ventricular end-diastolic pressure. Angiography revealed an extrinsic mass causing compression of the right atrium and the tricuspid anulus. A large clot overlying the right atrium and ventricle was found at emergency surgery. Postoperative cardiac tamponade may result in an atypical hemodynamic presentation when there is selective compression of one chamber or of a valve anulus.
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