Question

Suppose you have a patient that displays an extended P-Q interval. What electrical events occur during the P-Q interval, and what can you conclude specifically about the cardiac conduction system in a patient with a long P-Q interval?

Answer 1

Normally during the PQ interval (which is the time from the start of P wave to the start of Q wave) denotes the time taken by the electrical impulse to travel from atria through the AV node into the ventricles. Most of the PQ interval is caused by the delay of the impulse at the AV node.

So when there is increased PQ interval, it suggests the conduction abnormalities through the AV node as occur in cases of partial and complete AV blocks

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