Are normal sinus rhythm and accelerated junctional rhythm regular?

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Multiple Choice

Are normal sinus rhythm and accelerated junctional rhythm regular?

Regularity means the heartbeat comes at steady, evenly spaced intervals—the R–R intervals are almost identical from beat to beat. In normal sinus rhythm, the SA node drives the heart in a predictable, rhythmic pattern, so the QRS complexes occur at uniform intervals and every cycle is spaced the same way. An accelerated junctional rhythm still produces a steady rhythm, even though the origin of the impulse shifts to the AV junction. You’ll often see P waves that are absent, hidden, or inverted, and the rate sits in the 60–100 bpm range, but the timing between QRS complexes remains regular. So the rhythm is regular despite changes in P-wave appearance. That’s why the best answer is that both rhythms are regular.

Regularity means the heartbeat comes at steady, evenly spaced intervals—the R–R intervals are almost identical from beat to beat. In normal sinus rhythm, the SA node drives the heart in a predictable, rhythmic pattern, so the QRS complexes occur at uniform intervals and every cycle is spaced the same way.

An accelerated junctional rhythm still produces a steady rhythm, even though the origin of the impulse shifts to the AV junction. You’ll often see P waves that are absent, hidden, or inverted, and the rate sits in the 60–100 bpm range, but the timing between QRS complexes remains regular. So the rhythm is regular despite changes in P-wave appearance.

That’s why the best answer is that both rhythms are regular.

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