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J Thorac Cardiovasc Surg 2000;120:173-184
© 2000 The American Association for Thoracic Surgery


SURGERY FOR ACQUIRED CARDIOVASCULAR DISEASE

Isolated bypass grafting of the left internal thoracic artery to the left anterior descending coronary arteryLate consequences of incomplete revascularization

Rosalyn Scott, MDa, Eugene H. Blackstone, MDa,b, Patrick M. McCarthy, MDa, Bruce W. Lytle, MDa, Floyd D. Loop, MDa, Jennifer A. White, MSb, Delos M. Cosgrove, MDa

From the Department of Thoracic and Cardiovascular Surgerya and the Department of Biostatistics and Epidemiology,b The Cleveland Clinic Foundation, Cleveland, Ohio.

Address for reprints: Eugene H. Blackstone, MD, Department of Thoracic and Cardiovascular Surgery, 9500 Euclid Ave, Desk F25, Cleveland, OH 44195 (E-mail: blackse{at}ccf.org ).

Objective: Multiple strategies to achieve some degree of myocardial revascularization are available. In some, less complete revascularization is accepted to limit invasiveness. To examine the issues of incomplete revascularization, we assessed the long-term impact of additional non–left anterior descending coronary artery stenoses in patients undergoing only grafting of the left internal thoracic artery to the left anterior descending coronary artery.
Methods: A total of 2067 patients underwent primary isolated grafting of the left internal thoracic artery to the left anterior descending coronary artery from 1971 to 1997. Of these, 26% and 13% had 2- and 3-system disease, respectively. Multivariable analyses of survival and reintervention were performed in the hazard function domain for 27,683 patient-years of follow-up (mean 14 ± 6.7).
Results: Survival was 99%, 88%, and 62% at 1, 10, and 20 years. Right coronary artery or left circumflex system disease of 50% or more (P = .02) and particularly high-grade (>=70%) left circumflex (P = .01) and proximal right coronary artery disease (P = .01), as well as any degree of left main trunk stenosis (P < .0001), were associated with reduced long-term survival. Compared with 75% 20-year survival in patients with no non–left anterior descending disease, those with either left circumflex or left main trunk disease experienced a 44% survival, and those with proximal right coronary artery disease, 42%. The most common stated reason for incomplete revascularization was small vessel size. Freedom from reintervention was 89% and 65% at 10 and 20 years, respectively. High-grade left main trunk disease, but, in contrast, mid or distal disease of the right coronary artery, and not left circumflex disease, were risk factors for reintervention.
Conclusions: These findings call into question the long-term appropriateness of interventions whose strategy includes leaving unrevascularized segments in territories not in the distribution of the left anterior descending coronary artery.




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