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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