title: [The use of a rate-responsive pacemaker after heart transplantation].
abstract: OBJECTIVE
  The indications and the results of pacemaker implant following orthotopic cardiac transplantation.
  
  
  METHODS
  Four patients implanted a cardiac pacemaker (PM) in the early post-operative period (PO) of orthotopic cardiac transplantation (from 10th to 16th PO day). The patients were 33 to 55 year-old and the indications to PM were supraventricular arrhythmia (atrial fibrillation or flutter) associated with atrioventricular block in three, and complete atrioventricular block in one patient. Previous to PM implant, patients were submitted to endomyocardial biopsy, which was normal in two patients, evidenced mild rejection in one and moderate rejection in the remaining. A ventricular rate responsive pacemaker was implanted in all patients, with sensors responsive to muscular activity in one patient, and to minute ventilation in three.
  
  
  RESULTS
  One patient died in the 20th PO due to acute allograft rejection not controlled by immunosuppressive drugs. Three other patients had satisfactory evolution and the pacemakers were programmed during exercise testing, previous to hospital discharge. Recent evaluation revealed that these patients are in good clinical condition at the 6th, 14th and 24th PO months. Adequate pacemaker function was insured by exercise testing and ambulatory electrocardiographic recording.
  
  
  CONCLUSIONS
  A ventricular rate responsive pacemaker represented a satisfactory mode of pacing, in patients with severe bradycardia, following heart transplantation.
authors.affiliation: Instituto de Cardiologia do Rio Grande do Sul/Fundação Universitária de Cardiologia, Porto Alegre, RS.
authors.forename: J R
authors.initials: JR
authors.lastname: Sant'Anna
authors.forename: A R
authors.initials: AR
authors.lastname: Costa
authors.forename: R A
authors.initials: RA
authors.lastname: Kalil
authors.forename: F A
authors.initials: FA
authors.lastname: Lucchese
authors.forename: P R
authors.initials: PR
authors.lastname: Prates
authors.forename: E
authors.initials: E
authors.lastname: Pereira
authors.forename: I A
authors.initials: IA
authors.lastname: Nesralla
mesh_terms: D000328:Adult; D001145:Arrhythmias, Cardiac / Q000503:physiopathology / Q000628:therapy; D005260:Female; D006339:Heart Rate; D016027:Heart Transplantation / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial; D011182:Postoperative Care; D011183:Postoperative Complications / Q000503:physiopathology / Q000628:therapy; D013997:Time Factors
vernacular_title: Uso de marcapasso com resposta de freqüência após transplante cardíaco.