What term describes a rhythm with P waves before each QRS, a rate between 60 and 100 bpm, and a normal PR interval?

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Multiple Choice

What term describes a rhythm with P waves before each QRS, a rate between 60 and 100 bpm, and a normal PR interval?

Normal sinus rhythm is when the heartbeat starts in the sinoatrial node, so each beat has a P wave before every QRS complex, and the rate falls in the 60–100 bpm range with a normal PR interval. Seeing P waves preceding each QRS with a consistent, normal PR interval means atrial depolarization is occurring in the standard way and conducted to the ventricles without delay. That combination—P waves before each QRS, regular rhythm, and a normal PR interval—best fits a normal sinus rhythm. If the rate were above 100, it would be sinus tachycardia; if the P waves had a different form or didn’t precede every QRS, it could be an atrial tachycardia; and if the PR interval were prolonged or QRS drops were seen, an AV block would be suggested.

Normal sinus rhythm is when the heartbeat starts in the sinoatrial node, so each beat has a P wave before every QRS complex, and the rate falls in the 60–100 bpm range with a normal PR interval. Seeing P waves preceding each QRS with a consistent, normal PR interval means atrial depolarization is occurring in the standard way and conducted to the ventricles without delay. That combination—P waves before each QRS, regular rhythm, and a normal PR interval—best fits a normal sinus rhythm. If the rate were above 100, it would be sinus tachycardia; if the P waves had a different form or didn’t precede every QRS, it could be an atrial tachycardia; and if the PR interval were prolonged or QRS drops were seen, an AV block would be suggested.

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