Physiological AdaptationQuestion 765 of 2368
The nurse reviews a strip in which the PR interval grows longer with each beat until a P wave is not followed by a QRS complex, and then the pattern repeats. Which rhythm is this?
- Third-degree AV block
- Second-degree AV block, Type II
- First-degree AV block
- Second-degree AV block, Type I
Show answer
Correct answer: Second-degree AV block, Type I
Progressive PR prolongation followed by a dropped QRS is second-degree Type I block, also called Wenckebach.
Source: Nursing Advanced Skills (Open RN, Chippewa Valley Technical College, 2023), Interpret Basic ECG: Type I. Licensed under CC BY 4.0.
Practice the topic "Physiological Adaptation"Questions last reviewed: 18 October 2026