[New conduction disturbances and pacemaker indications after CoreValve® transcatheter aortic valve replacement. Incidence and follow up in a single center experience]. / Desarrollo de trastornos de conducción e indicaciones de marcapasos postimplante de válvula aórtica CoreValve® por vía endovascular. Incidencia y seguimiento en un solo centro.

ABSTRACT

INTRODUCTION: Transcatheter aortic valve implantation (TAVI) is currently reserved for patients with symptomatic aortic stenosis and high surgical risk. One major limiting factor related to TAVI procedural complications is conduction abnormalities and the need for permanent pacemaker implantation. OBJECTIVES: Evaluate the incidence of new conduction disturbances and pacemaker indications in patients with TAVI CoreValve® prosthesis (Medtronic Inc. Minneapolis, Minnesota, United States). METHODS: We included 28 patients, mean age 80 years. ECG parameters were evaluated previous and after implantation. All patients were monitorized during TAVI. Follow up Holter monitoring was performed at one, 6 and 12 months after the procedure and we also evaluated telemetry of implanted pacemaker. RESULTS: In previous ECG we found 7 patients had right bundle branch block and 7 patients had left bundle brunch block (LBBB). The post implant ECG showed 7 new LBBB 3 during valvuloplasty and 4 on the end of it. Six patients required pacemaker implantation for permanent or paroxysmal complete AV block (CAVB). At one year follow up, 3 patients with LBBB during valvuloplasty had a normal ECG, one still had LBBB and one an asymptomatic CAVB found in Holter monitoring. CONCLUSIONS: Conduction abnormalities are frequent after CoreValve® aortic valve prosthesis implantation. The incidence of new LBBB was 25%. CAVB during or post TAVI require PM implantation. New LBBB may need a closer follow up because in a 3% of the cases it may progress to CAVB.