Electrocardiographic remodeling during cardiac resynchronization therapy

Int J Cardiol. 2006 Apr 4;108(2):165-70. doi: 10.1016/j.ijcard.2005.04.029. Epub 2005 May 31.

Abstract

Background: More information is required on the relationship between electrical and structural reverse remodeling in patients treated with cardiac resynchronization therapy.

Methods: QRS and JT intervals were investigated during different pacing modes before and 3 months after implantation of a device for biventricular (BiV) pacing in 20 patients with severe drug-refractory heart failure (with left ventricular ejection fraction < 40% and QRS > 120 ms); structural remodeling was evaluated by echocardiography.

Results: QRS interval was significantly shortened by BiV pacing both acutely (p=0.002) and at 3 months (p=0.007). No significant change was found in the JT interval. The extent of QRS shortening obtained by BiV pacing showed moderate correlations with the reduction of end-systolic and end-diastolic volumes (r=0.53, p=0.016 and r=0.45, p=0.045, respectively) as well as with increase of left ventricular ejection fraction (r=0.49, p=0.028) at 3 months. The widening of QRS observed during right ventricular (RV) pacing was greater after 3 months of BiV pacing (with respect to acute assessments), suggesting accentuation of pacing-induced electrical dyssynchrony after a period of pacing-induced resynchronization.

Conclusion: The extent of QRS shortening induced by BiV pacing appears to correlate with the reverse structural remodeling (in terms of reduction in end-systolic volume). The acute changes and the remodeling process occurring at mid-term in the overall population of CRT-treated patients do not appear to involve the JT interval. A period of pacing-induced resynchronization appears to accentuate the potential for RV pacing-driven electrical dyssynchrony.

MeSH terms

  • Adult
  • Aged
  • Cardiac Pacing, Artificial*
  • Electrocardiography*
  • Female
  • Heart Failure / therapy*
  • Humans
  • Male
  • Middle Aged
  • Prospective Studies
  • Ventricular Remodeling*