Q: All of the following are contraindicated in tachyarrthymia of Wolff–Parkinson–White syndrome (WPW) except

A) Cardioversion,
B)  Adenosine, 
C) Diltiazem, 
D) Lopressor



Answer: A

AV node blockers should be avoided in atrial fibrillation and atrial flutter with WPW like adenosine, calcium channel blockers and beta blockers. They exacerbate the syndrome by blocking the heart's normal electrical pathway.