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Failure to improve left ventricular function after coronary revascularization for ischemic cardiomyopathy is not

H Samady1, J A Elefteriades, B G Abbott

  • 1Department of Internal Medicine, Section of Cardiovascular Medicine , Yale University School of Medicine, New Haven, CT 06520-8042, USA.

Circulation
|September 24, 1999
PubMed

Insights

Coronary artery bypass grafting (CABG) outcomes in patients with ischemic cardiomyopathy are similar whether or not left ventricular (LV) function improves post-surgery. Effective revascularization protects cardiac patients, regardless of LV ejection fraction (LVEF) changes.

Area of Science:

  • Cardiology
  • Cardiac Surgery
  • Myocardial Viability

Background:

  • Preoperative assessment of viable myocardium is crucial for patients with ischemic cardiomyopathy undergoing coronary artery bypass grafting (CABG).
  • Improved left ventricular (LV) function post-CABG can enhance patient outcomes, but the impact of unchanged LV function is less understood.

Purpose of the Study:

  • To investigate the association between the improvement of left ventricular ejection fraction (LVEF) after CABG and patient outcomes.
  • To determine if a lack of LVEF improvement post-CABG correlates with poorer long-term prognosis.

Main Methods:

  • Compared outcomes in patients with ischemic LV dysfunction (LVEF ≤ 0.30) who did and did not show significant LVEF improvement after CABG.
  • Assessed pre- and post-CABG LVEF in 104 patients, categorizing them into groups with LVEF improvement (Group A) and no significant change (Group B).
  • Monitored survival free of cardiac death and symptom scores at a mean follow-up of 32 months.

Main Results:

  • No significant differences in baseline characteristics or intraoperative variables were observed between groups.
  • Group A showed a significant LVEF increase (0.24 to 0.39), while Group B had no significant change (0.24 to 0.23).
  • Postoperative symptom improvement was similar in both groups, and survival free of cardiac death was comparable (93% in Group A vs. 94% in Group B).

Conclusions:

  • Lack of global LVEF improvement after CABG is not associated with poorer outcomes compared to patients with improved LVEF.
  • Effective myocardial revascularization, even without immediate functional improvement, appears to protect against future cardiac events.
  • The study suggests that successful revascularization is a key determinant of long-term survival in ischemic cardiomyopathy patients post-CABG.

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