Rate of junctional rhythm

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Multiple Choice

Rate of junctional rhythm

Explanation:
Junctional rhythm is when the AV node acts as the heart’s pacemaker, and its intrinsic firing rate is slower than the SA node. The classic rate for this rhythm is 40–60 beats per minute, so the best answer sits in that range. If the rate were higher, 60–100 bpm, that would be an accelerated junctional rhythm. If it’s 100 bpm or more, it’s junctional tachycardia. Rates around 20–40 bpm point to a slower ventricular escape rhythm rather than a junctional rhythm. On the ECG, P waves may be absent or inverted because atrial depolarization occurs retrogradely, and QRS is typically narrow unless a conduction problem is present.

Junctional rhythm is when the AV node acts as the heart’s pacemaker, and its intrinsic firing rate is slower than the SA node. The classic rate for this rhythm is 40–60 beats per minute, so the best answer sits in that range. If the rate were higher, 60–100 bpm, that would be an accelerated junctional rhythm. If it’s 100 bpm or more, it’s junctional tachycardia. Rates around 20–40 bpm point to a slower ventricular escape rhythm rather than a junctional rhythm. On the ECG, P waves may be absent or inverted because atrial depolarization occurs retrogradely, and QRS is typically narrow unless a conduction problem is present.

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