Question

First-degree heart block is characterized by

a. prolonged PR interval.
b. absent P waves.
c. variable PR interval.
d. widened QRS complex.

Answer 1

The answer is A. Prolonged PR interval.

Step-by-step explanation:

First-degree heart block is characterized by prolonged PR interval. First-degree A-V blockages occur when electrical impulses that move through the atrioventricular node are delayed, but not obstructed. It presents with a slow conduction and without lost beats.