Impact of glucose control on early vein graft failure after coronary artery bypass grafting: one-month angiographic results

To identify factors that determine early saphenous vein graft failure (VGF) within 1 month after coronary artery bypass grafting (CABG). Seven hundred forty-nine consecutive patients underwent primary isolated CABG with saphenous vein grafts at three Japanese centres from 1 January 2005 to 31 December 2014. According to angiographic findings within 1 month of CABG surgery, 63 patients (8.4%) developed early VGF. We examined the relationships between variables and early VGF by using multivariable logistic regression analysis. The preoperative clinical characteristics were similar between patients with and without early VGF, except for median preoperative haemoglobin A1c levels, which were significantly higher among patients with early VGF (6.7 vs 6.4%, P = 0.046). Additionally, anastomosis to the vessel with chronic total obstruction was performed more frequently among patients with early VGF (22/63 [34.9%] vs 140/686 [20.4%], P = 0.007), and myocardial infarction during the hospital admission occurred more frequently among patients with early VGF (4/63 [6.3%] vs 2/686 [0.3%], P < 0.0001). Results of multivariable analysis showed that the preoperative haemoglobin A1c level was associated with early VGF (odds ratio per unit increase, 1.30; 95% confidence interval, 1.06-1.60; P = 0.013). An increased preoperative haemoglobin A1c level was strongly associated with early VGF after CABG. Thus, VGF happened more frequently in patients with poorly controlled diabetes mellitus.