The impact of perivascular tissue preservation on 5-year patency of saphenous vein composite grafts.

OBJECTIVES:This retrospective study was conducted to evaluate the impact of saphenous vein(SV) harvesting with versus without perivascular tissue on the 5-year angiographic patency in coronary artery bypass grafting(CABG). METHODS:Among the 944 patients who received CABG between 2010 and 2015, 579 patients who received off-pump CABG using one SV as a Y-composite graft based on the in-situ left internal thoracic artery were enrolled. SV harvesting was performed using no-touch technique without perivascular tissue(the NoPVT group) in 342 patients and with perivascular tissue(the PVT group) in 237 patients. Follow-up duration was 84.0 months [interquartile range, 66.5-105.4]. Propensity score matching was performed, and long-term clinical outcomes and angiographic patency were compared. RESULTS:The average number of distal anastomoses per patient was comparable between the groups, although more SV grafts were anastomosed to left anterior descending territory in the PVT group than in the NoPVT group. Overall survival and cumulative incidence of cardiac death were comparable between the groups, whereas cumulative incidence of target vessel revascularization(1.3% vs 4.3% at 5 year, P = 0.009) and that of major adverse cardiac events(7.3% vs 9.9% at 5 year, P = 0.035) were lower in the PVT group than in the NoPVT group. One-year and 5-year angiographic patency rates of the SV grafts were higher in the PVT group than in the NoPVT group(97.0% vs 91.7% [P = 0.004] and 96.3% vs 89.9% [P = 0.007], respectively). CONCLUSIONS:SV grafts harvested using no-touch technique with perivascular tissue further improved the 5-year patency of SV composite grafts compared with those without perivascular tissue.