<prompt> A patient developed breathlessness and chest pain, on second postoperative day after a total hip replacement. Echo-cardiography showed right ventricular dilatation and tricuspid regurgitation. What is the most likely diagnosis-Acute MIPulmonary embolismHypotensive shockCardiac tamponate  <response>: Onset of chest pain and breathlessness, together with echocardiographic evidence of right ventricular dilatation and tricispid regurgitation after a high risk procedure like total hip replacement suggests a diagnosis of pulmonary embolism. REF:Campbells 11the Chapter-7 