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Relation of saphenous vein graft obstruction to serum cholesterol levels

H Daida1, H Yokoi, H Miyano

  • 1Division of Cardiology and Cardio-Thoracic Surgery, Juntendo University, Tokyo, Japan.

Journal of the American College of Cardiology
|January 1, 1995
PubMed

Insights

Lowering serum cholesterol levels is linked to reduced saphenous vein graft obstruction after coronary artery bypass surgery. This suggests lipid-lowering therapy may improve long-term graft survival.

Area of Science:

  • Cardiovascular Surgery
  • Vascular Biology
  • Atherosclerosis Research

Background:

  • Saphenous vein graft (SVG) atherosclerosis leads to graft obstruction, with ~50% occlusion within 10 years post-coronary artery bypass graft (CABG) surgery.
  • The impact of lipid control on long-term SVG patency remains incompletely understood.

Purpose of the Study:

  • To investigate the association between serum cholesterol levels and saphenous vein graft obstruction following CABG surgery.
  • To evaluate the potential of lipid-lowering therapy in preventing SVG occlusion.

Main Methods:

  • Retrospective review of 284 patients undergoing CABG (1976-1991) with at least one SVG, repeat arteriography, and pre-operative cholesterol ≥200 mg/dL.
  • Patients were stratified into three groups based on follow-up cholesterol levels: <200 mg/dL (Group I), 200-239 mg/dL (Group II), and ≥240 mg/dL (Group III).
  • Graft obstruction was defined as >70% luminal narrowing.

Main Results:

  • Seven-year non-obstruction rates were 88% in Group I, 61% in Group II, and 57% in Group III (p < 0.005).
  • This trend held true for grafts supplying the left anterior descending and other coronary arteries.
  • Lower cholesterol levels correlated significantly with better graft patency.

Conclusions:

  • Reduced serum cholesterol levels are associated with significantly lower rates of SVG obstruction up to seven years post-CABG.
  • These findings support the hypothesis that cholesterol-lowering interventions may enhance long-term saphenous vein graft survival after coronary artery bypass surgery.
Abstract

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