JVP wave with absent y descent and prominent X wave is seen in
JVP: the y descent is abolished due to an increase in intrapericardial pressure, preventing diastolic filling of the ventricles (cardiac tamponade causes an increase in both central venous pressure and pulmonary aery occlusion pressure). Cyanosis and pulmonary oedema may occur. Ref Davidson 23rd edition pg 334
Restrictive cardiomyopathy
Cardiac tamponade
Constrictive pericarditis
Right ventricular failure
C.V.S