title: Impact of right ventricular pacing on right ventricular function.
abstract: BACKGROUND
  The benefits of right ventricular pacing in patients with symptomatic bradycardia are well recognized. Currently, left ventricular (LV) function after cardiac pacing has already been extensively investigated. However existing data on right ventricular (RV) function in these patients is extremely limited.
  
  
  METHODS
  To test this, records of RV and tricuspid valve function of patients with a pacemaker measured at least a year after implantation were reviewed for a prevalence of RV dysfunction. The patients were also divided into those with and without RV dysfunction. Factors affecting the two groups were evaluated.
  
  
  RESULTS
  RV dysfunction and moderate to severe tricuspid valve regurgitation were found in approximately 4% and 21% respectively in cardiac pacing patients with mean implantation duration of 6.4 years. Compared to normal RV function, factors presumed to affect on RV dysfunction including site of pacing, pacing mode and percentage of ventricular pacing were not significantly different (p = 0.54, 0.37 and 0.12 respectively).
  
  
  CONCLUSIONS
  Based on these data, the prevalence of right ventricular dysfunction appears to be infrequent and factors that were assumed as contributors to LV dysfunction failed to show significant contributions to RV dysfunction.
authors.affiliation: Cardiology and Intervention Department, Central Chest Institute of Thailand, Bangkok, Thailand. drwalee@gmail.com
authors.forename: Pornwalee
authors.initials: P
authors.lastname: Porapakkham
authors.forename: Pramote
authors.initials: P
authors.lastname: Porapakkham
authors.forename: Jarin
authors.initials: J
authors.lastname: Assavahanrit
authors.forename: Boonchai
authors.initials: B
authors.lastname: Kijsanayotin
authors.forename: Keith Wing
authors.initials: KW
authors.lastname: Shing
mesh_terms: D000368:Aged; D001919:Bradycardia / Q000628:therapy; D002304:Cardiac Pacing, Artificial / Q000009:adverse effects / Q000379:methods / Q000706:statistics & numerical data; D004452:Echocardiography / Q000379:methods / Q000706:statistics & numerical data; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D013785:Thailand / Q000453:epidemiology; D013997:Time Factors; D014262:Tricuspid Valve Insufficiency / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D018497:Ventricular Dysfunction, Right / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology