<prompt> All are features, seen in cardiac tamponade, EXCEPT:Raised JVPPericardial effusionRapid y descentPulsus paradoxus  <response>: Ans. is c i.e. Rapid y descent In cardiac tamponade y descent is absent or slow. Rapid y descent is seen in constrictive pericarditis. Though Kussmaul sign is usually a feature of constrictive pericarditis, it can also be seen rare in tamponade. Distinguishing Features between Cardiac Tamponade and Constrictive Pericarditis Tamponade Constrictive Pericarditis Clinical Pulsus paradoxus Common Usually absent Jugular veins Raised JVP Present Present Prominent Y descent Absent Present Prominent X descent Present Absent Kussmauls sign Rare Present Third heart sound Absent Absent Pericardial knock Absent Often present ECG Electrical alternans May be present Absent Echocardiography Thickened pericardium Absent Present Pericardial calcification Absent Present Pericardial effusion Present Absent RV size Usually small Usually normal 