title: Short and long-term single-centre experience with an S-shaped unipolar lead for left ventricular pacing.
abstract: Left ventricular-based pacing is an established method for treatment of congestive heart failure in patients with ventricular dyssynchrony. The transvenous epicardial approach is the method of choice to pace the left ventricle.
  
  
  OBJECTIVE
  To evaluate short and long-term stability and pacing and sensing performance of an S-shaped non-steroid unipolar lead.
  
  
  METHODS
  Forty-eight procedures were performed in 43 consecutive patients (mean age: 70+/-8 years, 32 males) with severe congestive heart failure. The left ventricular lead was placed into a coronary sinus tributary. Pacing and sensing thresholds and pacing impedance were measured at implant, 1 and 6 months.
  
  
  RESULTS
  The mean procedure time was 90.0+/-35.5 min. Pacing thresholds at implant, 1 and 6 months were 1.1+/-0.8 V, 1.9+/-1.3 V and 1.9+/-1.5 V respectively. In 7 patients, lead implantation was unsuccessful. One of them had a successful second attempt. Lead revision was performed in 5 patients for loss of capture.
  
  
  CONCLUSIONS
  The S-shaped unipolar lead evaluated in this study provides stable long-term position and pacing thresholds. Recent improvement of this S-shaped lead model will hopefully reduce the rate of implantation failures and acute dislodgements.
authors.affiliation: Department of Cardiology, Brest University Hospital, Brest, France.
authors.forename: M
authors.initials: M
authors.lastname: Fatemi
authors.forename: Y
authors.initials: Y
authors.lastname: Etienne
authors.forename: M
authors.initials: M
authors.lastname: Gilard
authors.forename: J
authors.initials: J
authors.lastname: Mansourati
authors.forename: J J
authors.initials: JJ
authors.lastname: Blanc
mesh_terms: D000368:Aged; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006333:Heart Failure / Q000150:complications* / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D010138:Pacemaker, Artificial; D012680:Sensitivity and Specificity; D013997:Time Factors; D018487:Ventricular Dysfunction, Left / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy*; D014693:Ventricular Fibrillation / Q000209:etiology* / Q000503:physiopathology / Q000628:therapy*