title: The Micra Leadless Transcatheter Pacemaker. Implantation and Mid-term Follow-up Results in a Single Center.
abstract: OBJECTIVE
  Currently, studies on the leadless pacemaker (Micra) have mostly been limited to clinical trials with less than 6 months' follow-up and they often fail to reflect real population outcomes. We sought to evaluate electrical parameters at implantation and chronologically during follow-up, as well as the safety of this new technique.
  
  
  METHODS
  This prospective, observational study included 30 consecutive patients, all ≥ 65 years, with an indication for single-chamber pacemaker implantation.
  
  
  RESULTS
  Successful implantation was accomplished in all patients referred for leadless implantation. The mean age was 79.4±6.4 years (range, 66-89 years); 20 (66.6%) were men and 28 had permanent atrial fibrillation (93.3%); 1 had atrial tachycardia and 1 had sinus rhythm. Concomitant atrioventricular node ablation was performed immediately after implantation in 5 patients (16.6%), and implantation was performed after transcatheter aortic valve implantation in 2. The procedure was performed under an uninterrupted anticoagulation regimen (maximum INR 2.4) in 23 patients (76.6%). With the exception of 1 moderate pericardial effusion without tamponade, there were no severe complications. The mean follow-up was 5.3±3.3 months and 4 patients had more than 1 year of follow-up. Sensing and pacing parameters were stable both at implantation and during the short- to mid-term follow-up.
  
  
  CONCLUSIONS
  Implantation of leadless pacemakers is feasible, safe and provides advantages over the conventional system. Further studies with longer follow-up periods will be needed before these devices become widely used in routine clinical practice.
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain. Electronic address: luismartinezsande@gmail.com.
authors.forename: José Luis
authors.initials: JL
authors.lastname: Martínez-Sande
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: García-Seara
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: Moisés
authors.initials: M
authors.lastname: Rodríguez-Mañero
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: Xesús Alberte
authors.initials: XA
authors.lastname: Fernández-López
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: Laila
authors.initials: L
authors.lastname: González-Melchor
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: Alfredo
authors.initials: A
authors.lastname: Redondo-Diéguez
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: Rocío
authors.initials: R
authors.lastname: González-Ferreiro
authors.affiliation: Unidad de Arritmias y Electrofisiología Cardiaca, Servicio de Cardiología y Unidad Coronaria, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, A Coruña, Spain.
authors.forename: José Ramón
authors.initials: JR
authors.lastname: González-Juanatey
mesh_terms: D000359:Aftercare; D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation / Q000628:therapy; D006328:Cardiac Catheterization; D005260:Female; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D011446:Prospective Studies; D011474:Prosthesis Design; D019919:Prosthesis Implantation / Q000379:methods*; D013610:Tachycardia / Q000628:therapy; D016896:Treatment Outcome
keywords: Atrial fibrillation; Cardiac pacing; Estimulación cardiaca; Fibrilación auricular; Leadless pacemaker; Marcapasos percutáneo sin cable