Air Methods Critical Care Practice Exam 2025 - Free Critical Care Practice Questions and Study Guide

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What is the normal PR interval duration?

0.08-0.12 seconds

0.12-0.20 seconds

The normal PR interval duration, which represents the time taken for electrical impulses to travel from the atria to the ventricles of the heart, is indeed 0.12 to 0.20 seconds. This interval includes the time from the beginning of atrial depolarization to the beginning of ventricular depolarization.

Values falling within this range indicate that the conduction through the AV node is functioning well and that there are no signs of abnormalities, such as a blockage or delay in electrical conduction. A PR interval duration shorter than 0.12 seconds could suggest pre-excitation syndromes like Wolff-Parkinson-White syndrome, while a PR interval longer than 0.20 seconds may indicate first-degree AV block or other conduction issues. Understanding the normal duration of the PR interval is crucial for interpreting an ECG correctly and identifying potential cardiac conditions.

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0.20-0.25 seconds

0.25-0.30 seconds

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