Comparison of early postoperative results in patients with and without diabetes with low ejection fraction and normal serum creatinine values who underwent coronary artery bypass operation.

Background: Low left ventricular ejection fraction and renal insufficiency are factors that increase the risk of coronary artery bypass graft surgery in patients with diabetes mellitus. The aim of this study was to group patients with low left ventricular ejection fraction undergoing coronary artery bypass graft surgery according to the presence or absence of diabetes mellitus and to evaluate postoperative changes in serum creatinine levels and postoperative outcomes.

Methods: A total of 93 patients undergoing isolated coronary artery bypass grafting were included in this single-centre, retrospective, cohort study. Patients with a pre-operative low left ventricular ejection fraction of less than 35% were included in the study. Patients were divided into diabetic and non-diabetic groups and intra- and intergroup values were compared. Pre-operative, and postoperative days 2 and 5 serum creatinine levels of the patients were measured and compared.

Results: Of the 93 patients included in the study, 60 were in the diabetic group (group 1) and 33 were in the non-diabetic group (group 2). Postoperative 2- and 5-day creatinine levels were significantly higher in group 1 than in group 2 (p = 0.033 and p = 0.005, respectively). Postoperative 2- and 5-day creatinine levels were significantly higher than pre-operative creatinine levels in group 1 (p = 0.008 and p = 0.001, respectively). The intensive care unit stay was significantly longer in the diabetes mellitus group than in the group without diabetes mellitus (p = 0.031).

Conclusion: Following coronary artery bypass graft surgery in patients with low left ventricular ejection fraction, which is already a risk factor, creatinine levels were found to have increased in the diabetes mellitus group.