Which rhythm originates from the AV node, may have hidden or inverted P waves, and has a rate about 40-60 bpm?

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Multiple Choice

Which rhythm originates from the AV node, may have hidden or inverted P waves, and has a rate about 40-60 bpm?

Junctional rhythm comes from the AV node/AV junction, so the heartbeat is driven below the atria. Because the atria can be activated retrogradely by the AV node, the P waves may be inverted, hidden in the QRS, or appear after the QRS. The ventricular rate in this rhythm is typically about 40-60 beats per minute, and the QRS complex is usually narrow because ventricular conduction is intact. This matches the description: origin in the AV node, P waves that aren’t the normal preceding ones (often inverted or concealed), and a rate around 40-60. By contrast, normal sinus rhythm has upright P waves before every QRS and a rate 60-100; sinus bradycardia is slow but with normal P waves originating from the SA node; ventricular fibrillation is chaotic with no organized P waves or QRS.

Junctional rhythm comes from the AV node/AV junction, so the heartbeat is driven below the atria. Because the atria can be activated retrogradely by the AV node, the P waves may be inverted, hidden in the QRS, or appear after the QRS. The ventricular rate in this rhythm is typically about 40-60 beats per minute, and the QRS complex is usually narrow because ventricular conduction is intact.

This matches the description: origin in the AV node, P waves that aren’t the normal preceding ones (often inverted or concealed), and a rate around 40-60. By contrast, normal sinus rhythm has upright P waves before every QRS and a rate 60-100; sinus bradycardia is slow but with normal P waves originating from the SA node; ventricular fibrillation is chaotic with no organized P waves or QRS.

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