Second Degree AV Block (Mobitz type I, Wenkebach)

 

Rate

Variable
P wave

Normal morphology with constant P-P interval
QRS

Normal
Conduction

The P-R interval is progressively longer until one P wave is blocked; the cycle begins again following the blocked P wave.
Rhythm

Irregular

Second degree AV block type I occurs in the AV node above the Bundle of His.

It is often transient and may be due to acute inferior MI or digitalis toxicity.

Treatment is usually not indicated as this rhythm usually produces no symptoms.

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The Mobitz type I second degree AV block usually does not require any treatment.

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