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Risk factors for graft occlusion after coronary artery bypass grafting
J Eritsland1, H Arnesen, N B Fjeld
1Department of Cardiology, Ullevål University Hospital, Oslo, Norway.
Insights
Internal mammary artery graft occlusion in coronary artery bypass grafting is linked to body surface area, not gender. Vein graft occlusion relates to body surface area and ejection fraction, and is reduced by beta-blockers.
Area of Science:
- Cardiovascular Surgery
- Vascular Biology
- Medical Imaging
Background:
- Coronary artery bypass grafting (CABG) is a critical intervention for coronary artery disease.
- Graft patency is a key determinant of long-term CABG success.
- Factors influencing graft occlusion require further investigation.
Purpose of the Study:
- To investigate patient and graft characteristics associated with graft occlusion after CABG.
- To analyze predictors of internal mammary artery and vein graft patency.
Main Methods:
- A cohort of 610 patients undergoing CABG was followed for one year.
- Graft patency was assessed via angiography in 578 patients at approximately 12 months.
- Statistical analysis explored relationships between graft occlusion and patient/graft factors.
Main Results:
- Internal mammary artery graft occlusion was inversely related to body surface area and higher in women, but this gender difference disappeared when adjusted for body surface area.
- Vein graft occlusion was inversely related to body surface area and positively associated with ejection fraction.
- Pre- and perioperative beta-blocker use was associated with lower vein graft occlusion rates.
Conclusions:
- Body surface area is a significant factor in internal mammary artery graft occlusion, independent of gender.
- Vein graft occlusion is influenced by body surface area and cardiac function (ejection fraction).
- Beta-blocker therapy may improve vein graft patency post-CABG.
Abstract:
A cohort of 610 well-characterized patients undergoing coronary artery bypass grafting were followed through the first postoperative year. Graft patency was angiographically assessed in 578 (94.8%) of the patients on average 12.1 (SD 1.5) months postoperatively and was related to characteristics of grafts and patients. For internal mammary artery grafts the incidence of graft occlusion was higher in women than in men and was inversely related to body surface area. In multivariate analysis the influence of gender was no longer significant when adjusted for body surface area. With vein grafts the incidence of occlusion was inversely related to body surface area and was positively associated with ejection fraction. Occlusion of vein grafts was less common in patients treated with beta-blockers pre- and peroperatively.