Which rhythm has a rate below 60 bpm with regular rhythm and P waves?

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Multiple Choice

Which rhythm has a rate below 60 bpm with regular rhythm and P waves?

A rhythm where every QRS is preceded by a P wave and the rate is under 60 bpm points to the sinus node as the source, but with slowed firing. The P waves preceding each QRS show the atrial depolarization is controlled by the sinoatrial node, and the overall rate below 60 bpm identifies this as sinus bradycardia. Other rhythms either move the P waves to after the QRS or hide them, or they run faster (as in accelerated junctional) or at normal rates (as in normal sinus rhythm). So the combination of sinus-origin P waves and a rate under 60 bpm best fits sinus bradycardia.

A rhythm where every QRS is preceded by a P wave and the rate is under 60 bpm points to the sinus node as the source, but with slowed firing. The P waves preceding each QRS show the atrial depolarization is controlled by the sinoatrial node, and the overall rate below 60 bpm identifies this as sinus bradycardia. Other rhythms either move the P waves to after the QRS or hide them, or they run faster (as in accelerated junctional) or at normal rates (as in normal sinus rhythm). So the combination of sinus-origin P waves and a rate under 60 bpm best fits sinus bradycardia.

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