title: Complication of ventricular demand pacing after orthotopic heart transplantation: unusual case of pacemaker syndrome in an infant.
abstract: BACKGROUND
  Sinus node dysfunction is the most common indication for antibradycardiac permanent pacing after heart transplantation. Lack of atrioventricular synchrony during pacing can result in symptoms ranging from mild chest discomfort to severe manifestations such as dyspnea, hypotension, and cardiovascular collapse, all of which are ascribed to pacemaker syndrome. In infants pacemaker syndrome is often only recognized in the face of marked hemodynamic compromise.
  
  
  RESULTS
  This report details an unusual account of pacemaker syndrome in an infant after orthotopic heart transplantation.
  
  
  CONCLUSIONS
  Careful assessment of atrioventricular synchrony is important after infant transplantation.
authors.affiliation: Department of Pediatrics, Hospital for Sick Children, University of Toronto School of Medicine, Ontario, Canada.
authors.forename: G L
authors.initials: GL
authors.lastname: Smith
authors.forename: Y
authors.initials: Y
authors.lastname: Law
authors.forename: R
authors.initials: R
authors.lastname: Hamilton
authors.forename: L
authors.initials: L
authors.lastname: West
authors.forename: J
authors.initials: J
authors.lastname: Coles
authors.forename: L
authors.initials: L
authors.lastname: Benson
mesh_terms: D000787:Angina Pectoris / Q000209:etiology; D001146:Arrhythmia, Sinus / Q000209:etiology / Q000628:therapy; D001283:Atrioventricular Node / Q000503:physiopathology; D001919:Bradycardia / Q000628:therapy; D002304:Cardiac Pacing, Artificial / Q000009:adverse effects / Q000379:methods; D006332:Cardiomegaly / Q000209:etiology; D004417:Dyspnea / Q000209:etiology; D016027:Heart Transplantation / Q000502:physiology; D006439:Hemodynamics; D006801:Humans; D007022:Hypotension / Q000209:etiology; D007223:Infant; D009200:Myocardial Contraction; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D001261:Pulmonary Atelectasis / Q000209:etiology; D011654:Pulmonary Edema / Q000209:etiology; D012769:Shock / Q000209:etiology; D012804:Sick Sinus Syndrome / Q000628:therapy; D013577:Syndrome