title: Cardiac resynchronization therapy for non-ischemic cardiomyopathy-immediate changes in QRS duration, with left bundle branch block pattern on electrocardiogram.
abstract: BACKGROUND
  We evaluated mean QRS duration improvement immediately after cardiac resynchronization therapy (CRT) in patients with non-ischemic cardiomyopathy (NICM), with a left bundle branch block (LBBB) pattern on electrocardiogram (ECG), owing to obligatory right ventricular pacing or as a new finding; and to what extent.
  
  
  RESULTS
  We tabulated ECGs of 18 subjects, 24 hours before and after receiving CRT, for both groups. The percentage decreases of QRS duration in all groups were statistically similar (p<0.05). There was a significant negative correlation (p<0.05) between age and the percentage of the QRS decrease.
  
  
  CONCLUSIONS
  The study showed a greater reduction in QRS duration with CRT for younger subjects.
authors.affiliation: Dept of Internal Medicine, Maimonides Medical Center, Brooklyn, New York, USA. saurav.sphs@gmail.com
authors.forename: Saurav
authors.initials: S
authors.lastname: Chatterjee
authors.forename: Gunjan
authors.initials: G
authors.lastname: Guha
authors.forename: Joydeep
authors.initials: J
authors.lastname: Ghosh
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002037:Bundle-Branch Block / Q000503:physiopathology* / Q000628:therapy; D058406:Cardiac Resynchronization Therapy; D009202:Cardiomyopathies / Q000628:therapy*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged