Mid-term angiographic comparison of sequential and individual anastomosis techniques for diagonal artery

Objective: The mid-term patency rates for individual and sequential grafts as coronary bypass conduits for diagonal arteries were angiographically compared; the impact of native coronary vessel and type of the conduit characteristics are investigated. Methods: Between March 1992 and April 2000, we performed a total number of 811 distal anastomosis on diagonal arteries of left anterior descending (LAD) artery in 296 patients who underwent coronary artery bypass surgery (CABG) distal anastomosis in our clinic. The patients were divided into two groups in this prospective study. In group A (n=195) individual anastomosis technique, in group B (n=101) sequential anastomosis technique was chosen as the myocardial revascularization strategy. At an average of 49.4 +/- 13.2 months after coronary revascularization procedure coronary angiographies were evaluated. Individual and sequential grafting techniques were compared by graft patency rates. Results: The patency rates of sequential conduits were markedly higher than those of individual conduits (66.7% vs. 89.2%, p=0.0001). This difference was also clear in coronary arteries with poor quality and small (< 1.5 mm) diameter (49.1% vs. 66.6%, p=0.032). Also, the patency rates of sequential radial artery conduits were higher than sequential saphenous vein graft (SVG) conduits (sequential radial artery; 94.1%, sequential SVG; 85.3%, p=0.043). Conclusions: Sequential grafting for diagonal artery is technically more demanding but the mid-term results are better than individual grafting especially in coronary arteries with poor quality. Using radial artery as a sequential graft increases the mid-term graft patency rates.