What is the PR interval of junctional rhythms?

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Multiple Choice

What is the PR interval of junctional rhythms?

Explanation:
The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization. In junctional rhythms, the impulse starts near the AV node, so atrial activation and ventricular activation happen very close in time. This makes the PR interval shorter than normal, typically around 0.10 seconds or less. Normal PR interval is about 0.12–0.20 seconds, so this is a noticeably shortened conduction time. P waves may be hidden or inverted depending on how the atrial depolarization travels, but the defining feature of a junctional rhythm is a short (0.10 s or less) PR interval.

The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization. In junctional rhythms, the impulse starts near the AV node, so atrial activation and ventricular activation happen very close in time. This makes the PR interval shorter than normal, typically around 0.10 seconds or less. Normal PR interval is about 0.12–0.20 seconds, so this is a noticeably shortened conduction time. P waves may be hidden or inverted depending on how the atrial depolarization travels, but the defining feature of a junctional rhythm is a short (0.10 s or less) PR interval.

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