Objective: To compare the effects of intermittent classical blood cardioplegia and single-dose modified Del Nido cardioplegia on postoperative serum lactate levels and extubation time in patients undergoing coronary artery bypass grafts (CABG).

Study Design: An observational study.

Place and Duration of the Study: Department of Cardiovascular Surgery, Faculty of Medicine, Kastamonu University, Kastamonu, Turkiye, from 2020 to September 2023.

Methodology: Forty patients who underwent CABG between 2020 and 2023 were randomly divided into two groups. Group 1 formed 20 patients who received intermittent classical blood cardioplegia, and Group 2 formed 20 patients who received single-dose modified Del Nido cardioplegia. Demographic data, bypassed vessels, cardiopulmonary bypass (CPB) time, aortic cross clamp (ACC) time, postoperative drainage, inotrope required and extubation time, glomerular filtration rate (GFR), and serum lactate levels were recorded 2 hours after surgery. The Shapiro-Wilk test was utilised to evaluate the normality of data distribution. The Mann-Whitney U test was employed for variables that did not follow a normal distribution, whereas normally distributed variables were analysed using the independent samples t-test. Additionally, the chi-square test was applied to compare categorical variables across groups.

Results: No statistically significant differences were detected between the groups with respect to demographic data, ACC time, CPB time, bypassed vessels, postoperative drainage, inotrope requirement, or GFR. Postoperatively, lactate levels were statistically lower in Group 2 than in Group 1, and extubation time was statistically shorter in Group 2 than in Group 1 (p <0.001).

Conclusion: Modified Del Nido cardioplegia reduces postoperative lactate levels and extubation time. Therefore, modified Del Nido cardioplegia provides better patient stability and myocardial protection than the classical blood cardioplegia after CABG.