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Bypass grafting to the right coronary artery with and without endarterectomy: patency at one year
Insights
Combined endarterectomy and bypass grafting for the right coronary artery showed lower graft patency rates one year post-surgery compared to direct grafting. Success of endarterectomy depended on perfusing multiple branches.
Area of Science:
- Cardiovascular Surgery
- Interventional Cardiology
- Vascular Biology
Background:
- Coronary artery bypass grafting (CABG) is a standard treatment for coronary artery disease.
- Graft patency is a critical determinant of long-term outcomes after CABG.
- Endarterectomy combined with bypass grafting has been explored as an alternative for specific coronary artery lesions.
Purpose of the Study:
- To compare the one-year patency rates of grafts following combined endarterectomy and bypass grafting versus direct grafting to the right coronary artery and its branches.
- To identify factors influencing graft patency in patients undergoing these procedures.
Main Methods:
- Prospective study comparing three surgical techniques for the right coronary artery.
- 142 patients underwent repeat coronary arteriography one year after surgery.
- Graft patency was assessed in groups undergoing combined endarterectomy and bypass, direct grafting to the right coronary artery, and grafting to the posterior descending coronary artery.
Main Results:
- One-year graft patency was 72% for combined endarterectomy and bypass, versus 94% for direct grafts to the right coronary artery and 93% for grafts to the posterior descending artery.
- Direct grafting techniques demonstrated significantly higher patency rates than the combined procedure.
- Graft patency in the combined group correlated with the extent of atherosclerosis in the posterior descending artery and was not affected by platelet antagonists.
Conclusions:
- Direct grafting to the right coronary artery or its posterior descending branch yields superior one-year graft patency compared to combined endarterectomy and bypass grafting.
- Combined endarterectomy is most effective when a single graft can perfuse both the posterior descending and left ventricular branches.
- Surgical strategy should consider the extent of coronary atherosclerosis to optimize graft outcomes.
Abstract:
Between January 1979 and December 1981, 142 patients undergoing surgery to the right coronary artery agreed to have repeat coronary arteriography one year later. Thirty patients underwent combined endarterectomy and bypass grafting to the right coronary artery. The patency of these grafts was compared with that of grafts in 69 patients undergoing direct grafting to the right coronary artery and in 43 with grafting to the posterior descending coronary artery. There were two hospital deaths and one late death. No patients developed new inferior Q waves on the electrocardiogram. Repeat coronary arteriography at one year showed that 21 (72%) of the 29 grafts were patent after combined endarterectomy and bypass grafting to the right coronary artery. Sixty three (94%) grafts to the right coronary artery and 40 (93%) grafts to the posterior descending coronary artery were patent at one year. Direct grafts to the right coronary artery or its posterior descending branch had a significantly higher patency rate at one year than grafts to the endarterectomised right coronary artery. Graft patency after the combined procedure correlated with the extent of atherosclerosis in the posterior descending coronary artery. It was not influenced by treatment with platelet antagonists. Endarterectomy of the right coronary artery was most successful when it allowed a single graft to perfuse both the large posterior descending and left ventricular branches.