title: Single-lead VDD pacing: long-term experience with four different systems.
abstract: BACKGROUND
  Previous multicenter studies have shown that single-lead VDD pacing systems provide satisfactory atrial-triggered ventricular pacing at middle term for treatment of atrioventricular block without sinus dysfunction. However, we lack data on long-term results obtained with different VDD systems implanted in a large number of patients from a single center.
  
  
  METHODS
  One hundred fifty patients (76 +/- 11 years) with second- or third-degree atrioventricular block (n = 147) or symptomatic hypertrophic cardiomyopathy (n = 3) without sinus dysfunction were paced with four different VDD pacing systems able to sense the atrium and to pace the ventricle. Atrioventricular synchronization was assessed during follow-up by ECG and Holter monitoring.
  
  
  RESULTS
  Mean value of the atrial electrogram during implantation was 2.01 +/- 0.94 mV without any differences among the four systems. With a mean follow-up of 24 +/- 11 months, 95% of patients remain paced in VDD mode, whereas 5% have been reprogrammed in VVI or VVIR mode for permanent atrial fibrillation or loss of atrial sensing; 96% of patients with sinus atrium have atrioventricular synchronization >90% and 94% of patients have >95%, without significant difference between the four systems used.
  
  
  CONCLUSIONS
  These different single-lead VDD systems can provide satisfactory long-term atrioventricular synchronization; results are comparable to those obtained with conventional DDD pacing systems with two leads.
authors.affiliation: Cardiology Department, University Hospital, Amiens, France.
authors.forename: J L
authors.initials: JL
authors.lastname: Rey
authors.forename: C
authors.initials: C
authors.lastname: Tribouilloy
authors.forename: F
authors.initials: F
authors.lastname: Elghelbazouri
authors.forename: A
authors.initials: A
authors.lastname: Otmani
mesh_terms: D000368:Aged; D002312:Cardiomyopathy, Hypertrophic / Q000628:therapy; D004562:Electrocardiography; D005500:Follow-Up Studies; D006327:Heart Block / Q000628:therapy; D006801:Humans; D010138:Pacemaker, Artificial / Q000009:adverse effects