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Objective: The aim of this study was to compare the effects of two different cardioplegic solutions on nitric oxide (NO) release from coronary vasculature in patients with type II diabetes mellitus undergoing coronary artery bypass grafting (CABG) surgery., Methods: Forty patients undergoing elective CABG surgery were randomized to be given crystalloid (Group 1) or blood (Group 2) cardioplegia. Aortic and coronary sinus blood samples were taken at three different time periods and the release of NO from the coronary vasculature was determined by measuring its stable end-products, nitrite and nitrate. The difference between the aortic and coronary sinus concentrations of nitrite and nitrate represents the amount of NO released by coronary vascular bed., Results: Before application of aortic cross-clamp, at T1 period, the levels of nitrite/nitrate from the coronary vasculature were similar in both groups (6.53+/-1.21 microM vs 6.07+/-1.24 microM , p>0.05). However after the removal of cross-clamp, a significant decrease in NO was observed in Group 1 as compared with Group 2 (4.21+/-0.73 microM vs 4.92+/-1.02 microM, p<0.01) . This decrease persisted at T3 period, after 30 minutes of reperfusion in group 1 being significantly different from group 2 (3.86+/-0.49 vs 4.37+/-0.72 microM, p<0.05)., Conclusion: This study has shown that in patients with type II diabetes mellitus crystalloid cardioplegia causes a decrease in the release of NO from coronary vascular bed during aortic cross-clamp and reperfusion period whereas more physiologic blood cardioplegia did not. Our findings indicate that blood cardioplegia protects endothelial function better than crystalloid cardioplegia in diabetic patients.

Objective: The aim of this study is to evaluate the effects of single dose insulin, given prior to reperfusion, in patients undergoing coronary artery bypass surgery (CABG)., Methods: One hundred and twenty patients were prospectively randomized to be given either insulin (Group 1;n=60), or saline (Group 2;n= 60). Blood samples were taken 15 minutes before the reperfusion and insulin was given (0.3 IU/kg) to the patients in Group 1. Arterial and coronary sinus blood samples were taken, after the release of aortic cross-clamp (0. min), and 5th -10th -15th minutes of reperfusion. Arterial and coronary sinus lactate and glucose levels, postoperative insulin, inotropic and intraaortic balloon pump requirements; need for defibrillation and postoperative dysrhythmia, creatine kinase- MB (CPK-MB) levels, and length of stay in intensive care unit (ICU) and hospital were compared., Results: In Group 1, arterial lactate levels were found to be lower at 0.min, coronary sinus lactate levels were found to be lower at 0-5-10th minutes of reperfusion compared to Group 2. Similarly, defibrillation, glucose, postoperative insulin and inotrop requirements, postoperative arrhythmia and length of ICU stay were lower in Group 1. The CPK-MB levels and length of hospital stay were similar in all patients., Conclusions: We conclude that single dose insulin given before the reperfusion period, has positive perioperative effects. Therefore it can be used in patients undergoing CABG surgery to decrease ischemia-reperfusion injury.