|P wave||normal morphology with constant P-P interval|
|Conduction||the P-R interval is progressively longer until one P wave is blocked; the cycle begins again following the blocked P wave.|
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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