The PR interval of a first-degree AV block _____.
A) is constant and less than 0.12 second in duration
B) is constant and more than 0.20 second in duration
C) is generally progressive until a P wave appears without a QRS complex
D) gradually decreases in duration until a P wave appears without a QRS complex

Question

Quizplus · Accepted Answer

A first-degree AV block is present when there is a 1:1 relationship between P waves and QRS complexes and the PR interval is prolonged (i.e., more than 0.20 second) and constant.

The PR Interval of a First-Degree AV Block _____