[Advanced symptomatic atrioventricular block as a complication after transcatheter occlusion of secundum atrial septal defect in a 40-year-old woman with prior left bundle branch block].

We report a case of a woman with a left bundle branch block and secundum atrial septal defect (ASD) who underwent transcatheter occlusion using Amplatzer device. The patient was treated with antiarrhythmic drugs because of paroxysmal atrial flutter. One and a half month later the patient developed a second degree atrioventricular block. Temporary pacing was introduced, followed by a dual-chamber pacemaker implantation due to recurrent symptomatic atrioventricular block. An association between conduction disorders, the use of antiarrhythmic drugs and the complications after ASD closure is discussed.