Certified EkG technician (CET) Practice Exam

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What is an expected finding when there is impaired conduction through the AV node?

Shortened QT interval
Prolonged PR interval
Narrow QRS complex
Elevated ST segments

The correct answer is: Prolonged PR interval

When there is impaired conduction through the AV node, a prolonged PR interval is the expected finding. The PR interval represents the time it takes for electrical impulses to travel from the atria to the ventricles through the AV node. In cases where conduction through this node is slowed or impaired, the time between the atrial contraction (the P wave) and the ventricular contraction (the QRS complex) is significantly lengthened, resulting in a prolonged PR interval. This phenomenon often occurs in conditions such as first-degree AV block, where there is a consistent and consistent delay in conduction through the AV node, leading to a PR interval that exceeds the normal range of 0.12 to 0.20 seconds. Understanding this relationship between AV nodal conduction and the PR interval is crucial for accurately interpreting EKG readings and diagnosing potential cardiac conditions.