[Exercise-induced atrioventricular block. Significance of the ischemic component. Report of 4 new cases]. / Bloqueo auriculoventricular inducido por el esfuerzo. Importancia del componente isquémico. Presentación de cuatro nuevos casos.

We report four new cases of exercise-induced atrio-ventricular block (appearing during treadmill exercise testing). The mechanism was ischemia in two patients and the conduction disturbance disappeared after coronary artery bypass grafting. The literature on this matter is reviewed. Also the etiology, the natural history and management are discussed in these cases.