This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Pulsus alternans is seen in: March 2009 
Select and explain. 
A. MS with MR, B. AS with AR, C. Left ventricular failure, D. Digitalis poisoning
C: Left ventricular failure
Answer: C: Left ventricular failure 
Explanation: Ans. C: Left ventricular failure Pulsus alternans is a physical finding characterized by a regular alternation of the force of the aerial pulse. It almost invariably indicates the presence of severe left ventricular systolic dysfunction.