The P-R interval on an ECG reflects conduction through which structure?

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Multiple Choice

The P-R interval on an ECG reflects conduction through which structure?

Explanation:
The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization, which corresponds to the impulse’s travel through the AV node. The AV node introduces the deliberate delay that allows the ventricles to fill before they contract, so the PR interval reflects conduction through the AV node. The SA node initiates the impulse (affecting the P wave), and after the AV node the impulse travels rapidly through the Bundle of His and Purkinje system to activate the ventricles, which influences the QRS timing more than the PR interval.

The PR interval measures the time from the start of atrial depolarization to the start of ventricular depolarization, which corresponds to the impulse’s travel through the AV node. The AV node introduces the deliberate delay that allows the ventricles to fill before they contract, so the PR interval reflects conduction through the AV node.

The SA node initiates the impulse (affecting the P wave), and after the AV node the impulse travels rapidly through the Bundle of His and Purkinje system to activate the ventricles, which influences the QRS timing more than the PR interval.

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