First Degree AV Block

Rate	variable
P wave	normal
QRS	normal
Conduction	impulse originates in the SA node but has prolonged conduction in the AV junction; P-R interval is > 0.20 seconds.
Rhythm	regular

This is the most common conduction disturbance. It occurs in both healthy and diseased hearts.

First degree AV block can be due to:

Interventions include treating the underlying cause and observing for progression to a more advanced AV block.

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In first degree AV block, the P-R interval is: