What is the characteristic of the PR interval in junctional rhythms?

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Multiple Choice

What is the characteristic of the PR interval in junctional rhythms?

Explanation:
In junctional rhythms, the impulse starts in the AV junction, so the timing between atrial and ventricular activation is not fixed. If the atrial depolarization reaches the ventricles just before they depolarize, the PR interval tends to be shorter than normal. If atrial activation occurs retrogradely or after the ventricles, the PR interval can be longer than normal, or the P waves may even be hidden, making the interval hard to measure. Because the atrial-to-ventricular conduction timing can vary with this near-junction origin, the PR interval is best described as being short or long, rather than consistently normal.

In junctional rhythms, the impulse starts in the AV junction, so the timing between atrial and ventricular activation is not fixed. If the atrial depolarization reaches the ventricles just before they depolarize, the PR interval tends to be shorter than normal. If atrial activation occurs retrogradely or after the ventricles, the PR interval can be longer than normal, or the P waves may even be hidden, making the interval hard to measure. Because the atrial-to-ventricular conduction timing can vary with this near-junction origin, the PR interval is best described as being short or long, rather than consistently normal.

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