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First-degree heart block is characterized by
a. prolonged PR interval.
b. absent P waves.
c. variable PR interval.
d. widened QRS complex.

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Answer:

The answer is A. Prolonged PR interval.

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.

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