This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
Paroxysmal AV block is associated with: 
Select and explain. 
A. First degree block, B. Type I second degree block, C. Type II second degree block, D. Third degree block
C: Type II second degree block
Answer: C: Type II second degree block 
Explanation: Ans. C. Type II second degree block* Paroxysmal AV block are series of non-conducted P waves associated with Second-degree AV block (particularly type II).* It implies significant conduction system disease and is an indication for permanent pacing.ECG shows multiple non-conducted P waves after a period of sinus bradycardia with a normal PR interval.