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16 August, 22:49

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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Answers (1)
  1. 17 August, 02:14
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    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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