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Related Experiment Videos

Does competitive flow reduce internal thoracic artery graft patency?

Joseph F Sabik1, Bruce W Lytle, Eugene H Blackstone

  • 1Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. sabikj@ccf.org

The Annals of Thoracic Surgery
|November 7, 2003
PubMed
Summary

Internal thoracic artery (ITA) graft patency decreases with increased coronary competitive flow. However, moderate stenosis does not necessitate abandoning ITA use in coronary artery bypass grafting (CABG).

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Area of Science:

  • Cardiovascular Surgery
  • Vascular Biology
  • Graft Patency Research

Background:

  • Competitive flow in coronary arteries with moderate stenosis can lead to internal thoracic artery (ITA) graft occlusion.
  • Understanding the relationship between stenosis severity and ITA patency is crucial for surgical decision-making.

Purpose of the Study:

  • To determine if competitive flow negatively impacts ITA graft patency.
  • To identify a specific degree of coronary stenosis below which ITA use might be inadvisable.

Main Methods:

  • Analysis of 2,121 ITA grafts from 50,278 patients undergoing coronary artery bypass grafting (CABG) between 1972 and 1999.
  • Longitudinal analysis to model time-related ITA occlusion and identify risk factors, using proximal coronary stenosis as a surrogate for competitive flow.

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Main Results:

  • Overall ITA patency rates were high (93% at 1 year, declining to 92% at 15 years).
  • Lesser degrees of proximal coronary stenosis were significantly associated with increased ITA occlusion risk (p < 0.0001).
  • ITA patency declined as stenosis severity decreased, but without a sharp drop-off at any specific stenosis grade.

Conclusions:

  • Internal thoracic artery (ITA) graft patency is inversely related to the degree of coronary competitive flow.
  • Despite the association, moderate grades of coronary stenosis should not be an absolute contraindication for ITA graft utilization.