second-degree atrioventricular block Mobitz type I atrioventricular block AV block second degree Mobitz type I type 1 2nd degree AV block Mobitz I A disorder characterized by an electrocardiographic finding of intermittent failure of atrial electrical impulse conduction to the ventricles, characterized by a progressively lengthening PR interval prior to the block of an atrial impulse. (CDISC) AV block second degree Möbitz type I type 1 second degree AV block Mobitz type I second degree AV block Möbitz type I second degree AV block Wenckebach block type 1 second degree atrioventricular block MONDO:0020744 second degree atrioventricular block Mobitz type I second degree atrioventricular block Möbitz type I NCIT:C62017 Mobitz type I UMLS:C0264907 Möbitz I MEDGEN:82687