What is the normal PR interval in seconds?

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Multiple Choice

What is the normal PR interval in seconds?

Explanation:
The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization, including the delay in the AV node. In a healthy heart, this interval is 0.12 to 0.20 seconds (120–200 ms). This range reflects normal conduction from the atria through the AV node to the ventricles. A shorter interval, such as 0.08–0.12 seconds, would indicate faster-than-normal conduction with no typical AV delay, which can occur with preexcitation or artifacts. Intervals longer than 0.20 seconds, like 0.22–0.30 or 0.30–0.50 seconds, point to some form of AV nodal or conduction delay, such as first-degree AV block. So the normal range is 0.12 to 0.20 seconds.

The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization, including the delay in the AV node. In a healthy heart, this interval is 0.12 to 0.20 seconds (120–200 ms). This range reflects normal conduction from the atria through the AV node to the ventricles. A shorter interval, such as 0.08–0.12 seconds, would indicate faster-than-normal conduction with no typical AV delay, which can occur with preexcitation or artifacts. Intervals longer than 0.20 seconds, like 0.22–0.30 or 0.30–0.50 seconds, point to some form of AV nodal or conduction delay, such as first-degree AV block. So the normal range is 0.12 to 0.20 seconds.

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