title: Presence of angiographic coronary collaterals predicts myocardial recovery after coronary bypass surgery in patients with severe left ventricular dysfunction.
abstract: BACKGROUND
  Patients with coronary artery disease and left ventricular dysfunction (LVD) may have areas of hibernating myocardium that improve functionally after revascularization. Coronary collateral circulation may sustain ischemic, dysfunctional myocardium and favor myocardial recovery after revascularization. We evaluated the effect of angiographic coronary collaterals on myocardial functional recovery after coronary bypass graft (CABG) surgery in a group of patients with severe LVD.
  
  
  RESULTS
  Forty-one patients with multivessel coronary artery disease and advanced LVD (left ventricular ejection fraction [LVEF] 25 +/- 5%) undergoing CABG were identified from a prospective database. Preoperative coronary angiograms were evaluated for collaterals, which were graded according to Rentrop's classification (0 to 3), and a collateral index was calculated (collateral sum divided by 3). Preoperative and postoperative radionuclide ventriculograms provided global LVEF and regional ejection fractions. Of 123 regions evaluated, 120 were dysfunctional at baseline. Virtually all (122 of 123) regions were subtended by an artery with > or = 70% stenosis that was bypassed. Thirty-eight (81%) of 47 dysfunctional regions with grade 2 or 3 collaterals improved regional ejection fraction after surgery versus 38 (52%) of 73 dysfunctional regions with grade 0 or 1 collaterals (P = 0.0018). Global LVEF was 34 +/- 10% after surgery (P < 0.001 versus before surgery). Among patients with a global LVEF increase > or = 10%, collateral index was 1.81 versus 0.83 in those with an LVEF increase < 10% (P = 0.005).
  
  
  CONCLUSIONS
  In this population of patients with coronary artery disease with severe LVD, the presence of angiographic grade 2 or 3 collaterals predicted recovery of regional and global myocardial function after CABG.
authors.affiliation: Department of Cardiology, Baystate Medical Center, Springfield, MA 01199, USA.
authors.forename: H
authors.initials: H
authors.lastname: Kozman
authors.forename: J R
authors.initials: JR
authors.lastname: Cook
authors.forename: A H
authors.initials: AH
authors.lastname: Wiseman
authors.forename: R H
authors.initials: RH
authors.lastname: Dann
authors.forename: R M
authors.initials: RM
authors.lastname: Engelman
mesh_terms: D000368:Aged; D002314:Cardioplegic Solutions / Q000494:pharmacology*; D003097:Collateral Circulation / Q000502:physiology*; D017023:Coronary Angiography; D001026:Coronary Artery Bypass; D003326:Coronary Circulation / Q000502:physiology*; D005260:Female; D005544:Forecasting; D006321:Heart / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015635:Radionuclide Ventriculography; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*
chemical_list: D002314:Cardioplegic Solutions