Explanation
Wenckebach phenomenon is a form of incomplete atrio-ventricular heart block in which there is progressive lengthening of conduction time in cardiac tissue with P-R interval increasing until there is not a ventricular response.

This is followed by a conducted beat with a short P-R interval, and then the cycle repeats itself. This occurs frequently after an inferior myocardial infarction and tends to be self-limiting.
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