This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Pulsus paradoxus is seen in all except 
Select and explain. 
A. IPPV, B. COPD, C. Cardiac tamponade, D. Constrictive pericarditis
A: IPPV
Answer: A: IPPV 
Explanation: Ref Harrison 19 th ed pg 1573 t 288-2 Pulsus paradoxus is not a feature of IPPV. Pulsus paradoxus may be seen in association with cardiac tamponade, constrictive pericarditis and COPD