<prompt> A post-operative cardiac surgical patient developed sudden hypotension, raised central venous pressure, pulsus paradoxus at the 4th post operative hour. The most probable diagnosis is:Excessive mediastinal bleedingVentricular dysfunctionCongestive cardiac failureCardiac tamponade  <response>: Answer is D Cardiac tamponade Features of rising pressure, falling aerial pressure and pulsus paradoxus following surgery on the hea leads us to the diagnosis of cardiac tamponade. 