RN Exam Practice
Physiological AdaptationQuestion 757 of 2368

A client has a consistent PR interval of 0.24 seconds with one P wave before every QRS complex. The client has no symptoms. Which rhythm does the nurse identify?

  1. Third-degree AV block
  2. Second-degree AV block, Type I
  3. Second-degree AV block, Type II
  4. First-degree AV block
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Correct answer: First-degree AV block

First-degree AV block is a PR interval over 0.2 seconds, with one P wave before every QRS at a consistent length.

Source: Nursing Advanced Skills (Open RN, Chippewa Valley Technical College, 2023), Interpret Basic ECG: First-Degree Heart Block. Licensed under CC BY 4.0.

Practice the topic "Physiological Adaptation"

Questions last reviewed: 18 October 2026