The PR interval of a first-degree AV block _____
a. is constant and less than 0.12 seconds in duration
b. is constant and more than 0.20 seconds 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
B
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 seconds) and constant.
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