What is the typical duration of the PR interval on a normal ECG?

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Prepare for the ECCO Caring for Patients with Cardiovascular Disorders Part 1 Test. Utilize flashcards and multiple-choice questions, complemented by hints and explanations for each query. Gear up for success in your exam!

Multiple Choice

What is the typical duration of the PR interval on a normal ECG?

Explanation:
The PR interval reflects the time from the start of atrial depolarization to the start of ventricular depolarization, essentially the conduction time through the AV node. In a normal ECG, this interval is about 0.12 to 0.20 seconds (120–200 ms), indicating normal AV nodal conduction. Durations shorter than this are not typical for PR and longer durations, such as 0.30–0.40 seconds or 0.50–0.60 seconds, suggest slowed conduction or AV block.

The PR interval reflects the time from the start of atrial depolarization to the start of ventricular depolarization, essentially the conduction time through the AV node. In a normal ECG, this interval is about 0.12 to 0.20 seconds (120–200 ms), indicating normal AV nodal conduction. Durations shorter than this are not typical for PR and longer durations, such as 0.30–0.40 seconds or 0.50–0.60 seconds, suggest slowed conduction or AV block.

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