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PR interval: Wikis

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Schematic representation of normal ECG

The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex. It is usually 120 to 200 ms long. On an ECG tracing, this corresponds to 3 to 5 small boxes. The PR interval reflects the time the electrical impulse takes to travel from the sinus node through the AV node and entering the ventricles. The PR interval is therefore a good estimate of AV node function.

In case a Q wave was measured with an ECG, the PR interval is also commonly named "PQ interval" instead.

Interpretation

Variations in the PR interval can be associated with certain medical conditions:

References

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