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
Kussmaul's sign is not seen in: September 2010 
Select and explain. 
A. Right Ventricular infarction, B. Constrictive pericarditis, C. Restrictive cardiomyopathy, D. Cardiac tamponade
D: Cardiac tamponade
Answer: D: Cardiac tamponade 
Explanation: Ans. D: Cardiac tamponade Possible causes of Kussmaul's sign include: Constrictive pericarditis Restrictive cardiomyopathy Pericardial effusion Right ventricular infarction Right hea failure Cardiac tumours Tricuspid stenosis With Cardiac tamponade, KS is absent (lack of inspiratory decline in jugular venous pressure), yet jugular veins are distended and typically show a prominent x descent and an absent y descent as opposed to patients with constrictive pericarditis).