With first-degree AV block:
A) the PR intervals are less than 0.20 seconds.
B) the PR intervals are greater than 0.20 seconds.
C) the P waves are inverted.
D) not all the P waves are followed by a QRS.

Question

Quizplus · Accepted Answer

First-degree AV block is defined as a prolonged PR interval, which is greater than 0.20 seconds. The P waves are usually normal and upright, and each P wave is followed by a QRS complex. There is no requirement for the P waves to be inverted, nor is there an issue with dropped beats.

With First-Degree AV Block