title: Right ventricular pacing impairs endothelial function in man.
abstract: OBJECTIVE
  Clinical trial data show that right ventricular pacing worsens cardiovascular outcomes. The underlying pathophysiology of this is undetermined. We studied the effects of right ventricular pacing on cardiac measures of vascular health (endothelial function), ventricular wall stress (B-type natriuretic peptide), and cardiac reserve (cardiac output response to exercise) in subjects with pacemakers.
  
  
  RESULTS
  Twenty-two subjects [mean age 68.4 ± 8.8 (SD) years] with dual-chamber pacemakers implanted for sino-atrial disease were studied in a randomized crossover study comparing minimal right ventricular pacing [RVP-min; pacing with long atrioventricular delay (AVD)] to maximal right ventricular pacing (RVP-max; pacing with short AVD). Endothelial function was measured with reactive hyperaemia peripheral arterial tonometry. Cardiac output at rest and during exercise was determined using an inert gas rebreathing method. Right ventricular pacing was significantly higher in RVP-max when compared with RVP-min (90 ± 16 vs. 15 ± 20%, P < 0.001). Reactive hyperaemia peripheral arterial tonometry index was significantly lower after RVP-max vs. RVP-min (1.73 ± 0.33 vs. 1.96 ± 0.37, P < 0.05). B-type natriuretic peptide was not significantly different between pacing modes (113 ± 80 vs. 104 ± 108 pg/mL, P = NS). Cardiac output at peak exercise was significantly lower during RVP-max (7.65 ± 3.15 vs. 7.05 ± 2.61 L/min, P < 0.05).
  
  
  CONCLUSIONS
  Right ventricular pacing is associated with worsened endothelial function and cardiac reserve.
authors.affiliation: Centre for Cardiovascular and Lung Biology, University of Dundee, Ninewells Hospital and Medical School, Dundee DD1 9SY, UK. a.choy@dundee.ac.uk
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Choy
authors.forename: Henry H M
authors.initials: HH
authors.lastname: Su
authors.forename: Douglas H J
authors.initials: DH
authors.lastname: Elder
authors.forename: Awsan
authors.initials: A
authors.lastname: Noman
authors.forename: Maheshwar
authors.initials: M
authors.lastname: Pauriah
authors.forename: Allan D
authors.initials: AD
authors.lastname: Struthers
authors.forename: Chim C
authors.initials: CC
authors.lastname: Lang
mesh_terms: D000368:Aged; D002302:Cardiac Output / Q000502:physiology; D058406:Cardiac Resynchronization Therapy / Q000379:methods*; D018592:Cross-Over Studies; D004730:Endothelium, Vascular / Q000503:physiopathology*; D015444:Exercise / Q000502:physiology; D005260:Female; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020097:Natriuretic Peptide, Brain / Q000097:blood; D010138:Pacemaker, Artificial; D011379:Prognosis; D012146:Rest / Q000502:physiology; D012849:Sinoatrial Node / Q000503:physiopathology*; D018754:Ventricular Dysfunction / Q000097:blood / Q000503:physiopathology* / Q000628:therapy*
chemical_list: D020097:Natriuretic Peptide, Brain