This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Valvular Heart Disease, Subject name: Medicine
Most common cause of acute RVF - 
Select and explain. 
A. Massive pulmonary embolism, B. Tricuspid stenosis, C. Pulmonary stenosis, D. Tricuspid regurgitation
A: Massive pulmonary embolism
Answer: A: Massive pulmonary embolism 
Explanation: Ans. is 'a' i.e., Massive pulmonary embolism Acute right ventricular failure is usually caused by acute cor pulmonales.Most common cause of acute cor pulmonale is pulmonary embolism.M.C. cause of chronic cor pulmonale is pulmonary embolismCauses of acute right heart failurePulmonary embolism (M.C.)Acute respiratory failure (especially in Broncho pulmonary disease with hypoxic / hypercapnic pulmonary vasoconstrictions.ARDSSepsisAcutely exacerbated chronic (left / biventricular) heart failureAcute inferior myocardial infarction involving the R.V.