Definitions of second degree atrioventricular block: An exercise of logic in clinical electrocardiography.

Second degree atrioventricular block has received different definitions whi ch make it difficult for physicians to interpret certain cases. This review of the literature provides an accurate definition of the criteria of Mobit z I and Mobitz II atrioventricular block, and proposes simple diagnostic me thods based on conventional electrocardiography. The importance of the defi nitions is underlined and the consequences in terms of permanent cardiac pa cing are emphasised.