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Coronary sinus versus aortic root perfusion with blood cardioplegia in elective myocardial revascularization
A C Fiore1, K S Naunheim, G C Kaiser
1Department of Surgery, St. Louis University Medical Center, MO 63110-0250.
Insights
Retrograde coronary sinus cardioplegia is a safe alternative to aortic root delivery for patients undergoing coronary artery bypass grafting. However, this method offers no significant advantages in elective myocardial revascularization outcomes.
Area of Science:
- Cardiology
- Cardiac Surgery
Background:
- The efficacy of retrograde coronary sinus cardioplegia in coronary artery bypass grafting (CABG) remains incompletely understood.
- Standard antegrade delivery via the aortic root is common practice.
Purpose of the Study:
- To compare the safety and efficacy of retrograde coronary sinus cardioplegia versus antegrade aortic root cardioplegia in patients undergoing elective CABG.
Main Methods:
- A prospective study involving 40 patients undergoing elective CABG.
- Patients were randomized to receive either aortic root (n=20) or coronary sinus (n=20) cold potassium blood cardioplegia.
- Key perioperative and postoperative outcomes were assessed.
Main Results:
- The coronary sinus group experienced longer times for cardioplegia delivery and cardiac arrest induction.
- No significant differences were observed in postoperative enzymatic indices, hemodynamic parameters, or clinical outcomes between the groups.
- Right ventricular function was preserved equally in both groups.
Conclusions:
- Retrograde coronary sinus cardioplegia is a safe alternative to aortic root cardioplegia for elective CABG.
- This technique does not provide superior clinical or functional benefits compared to the standard aortic root method.
Abstract:
The role of retrograde coronary sinus cardioplegia in patients undergoing elective coronary artery bypass grafting has not been fully defined. Forty patients undergoing coronary artery bypass grafting received either aortic root (20 patients) or coronary sinus (20 patients) cold potassium blood cardioplegia. The patients were similar with respect to age, ventricular function, severity of coronary artery disease, cross-clamp time, completeness of revascularization, frequency of internal mammary artery grafting, and mean infusate volume and temperature. The time required to deliver the initial dose of cardioplegic solution and the time to achieve arrest were prolonged in the coronary sinus group (p less than 0.001 and p less than 0.02, respectively). There were no differences between the two groups postoperatively with regard to enzymatic indices, hemodynamic measurement, or clinical outcome. Right ventricular function was preserved equally in both groups. We conclude that coronary sinus cardioplegia is a safe alternative to aortic root perfusion, but offers no advantage in elective myocardial revascularization.