Initial experience with low-potassium cold blood cardioplegia: a clinical comparative study

Area of Science:

• Cardiology
• Cardiac Surgery
• Cardioplegia Solutions

Background:

• Coronary artery disease (CAD) necessitates surgical intervention like bypass grafting.
• Myocardial protection during cardiopulmonary bypass is critical for patient outcomes.
• Traditional cold crystalloid solutions have limitations in protecting the myocardium.

Purpose of the Study:

• To compare the efficacy of cold crystalloid cardioplegia versus cold blood low-potassium cardioplegia.
• To evaluate myocardial protection strategies in patients undergoing bypass grafting for triple-vessel CAD.
• To assess the impact of different cardioplegia solutions on post-operative cardiac function and myocardial injury markers.

Main Methods:

• Retrospective analysis of 96 patients with triple-vessel CAD undergoing bypass grafting.
• Comparison between two groups: cold crystalloid solution (n=54) and cold blood low-potassium cardioplegia (n=42).
• Assessment of post-operative cardiac index, left ventricular stroke work index, myocardial infarction incidence, and creatine kinase-MB release.

Main Results:

• No significant differences in post-bypass cardiac index or left ventricular stroke work index between groups.
• Impaired pre-bypass left ventricular function correlated with longer aortic cross-clamping in the crystalloid group, but not in the blood cardioplegia group.
• Significantly reduced release of creatine kinase-MB (myocardial damage marker) in the low-potassium blood cardioplegia group.
• Marked reduction in operative fluid administration with low-potassium blood cardioplegia.

Conclusions:

• Low-potassium cold blood cardioplegia provides effective myocardial protection during bypass grafting.
• This method ensures left ventricular stroke work index recovery independent of aortic occlusion duration.
• Reduced creatine kinase-MB release suggests superior myocardial preservation with low-potassium blood cardioplegia.