What is the normal PR interval for sinus rhythm?

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Multiple Choice

What is the normal PR interval for sinus rhythm?

Explanation:
The PR interval is the time from the start of the P wave to the start of the QRS complex, reflecting atrial depolarization plus conduction through the AV node to the ventricles. In normal sinus rhythm, this conduction time is about 0.12 to 0.20 seconds (120–200 ms) because the AV node provides a normal delay that coordinates atrial and ventricular beats. If the interval is shorter than about 0.12 s, it can suggest pre-excitation or an accessory pathway; if longer than about 0.20 s, it indicates some degree of AV block. Among the options, the range that fits normal sinus rhythm is 0.12–0.20 seconds.

The PR interval is the time from the start of the P wave to the start of the QRS complex, reflecting atrial depolarization plus conduction through the AV node to the ventricles. In normal sinus rhythm, this conduction time is about 0.12 to 0.20 seconds (120–200 ms) because the AV node provides a normal delay that coordinates atrial and ventricular beats. If the interval is shorter than about 0.12 s, it can suggest pre-excitation or an accessory pathway; if longer than about 0.20 s, it indicates some degree of AV block. Among the options, the range that fits normal sinus rhythm is 0.12–0.20 seconds.

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