Second-Degree Atrioventricular Block: A Reappraisal From: Mayo Clinic Proceedings | Date: January 1, 2001| Author: | Copyright Mayo Foundation for Medical Education and Research Jan 2001. Provided by ProQuest LLC.Copyright information

Review

In this review, we discuss the various forms and causes of second-degree atrioventricular (AV) block and the reasons they remain poorly understood. Both type I and type II block characterize block of a single sinus P wave. Type I block describes visible, differing, and generally decremental AV conduction. Type II block describes what appears to be an all-or-none conduction without visible changes in the AV conduction time before and after the blocked impulse. Although the diagnosis of type II block is possible with an increasing sinus rate, absence of sinus slowing is an important ...

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