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Combined antegrade/retrograde cardioplegia for myocardial protection: a clinical trial
J N Bhayana1, T Kalmbach, F V Booth
1Department of Surgery, State University of New York, Buffalo General Hospital 14203.
Insights
Combined antegrade and retrograde cardioplegia safely enhances myocardial protection during coronary artery bypass surgery. This approach significantly improves left ventricular function recovery post-procedure.
Area of Science:
- Cardiology
- Cardiac Surgery
- Myocardial Preservation
Background:
- The efficacy of retrograde coronary sinus perfusion for ischemic myocardium preservation remains debated.
- Coronary artery bypass surgery (CABG) necessitates effective myocardial protection strategies.
Purpose of the Study:
- To evaluate the safety and efficacy of combined antegrade and retrograde cardioplegia in CABG patients.
- To compare myocardial functional recovery between antegrade-only and combined cardioplegia approaches.
Main Methods:
- A comparative study involving 59 CABG patients divided into antegrade-only (n=19) and combined antegrade/retrograde cardioplegia (n=40) groups.
- Hemodynamic parameters and myocardial function (left ventricular stroke work index) were monitored pre- and post-cardiopulmonary bypass.
- Patient demographics and postoperative outcomes (arrhythmias, infarction, mortality) were assessed.
Main Results:
- Both groups exhibited similar baseline characteristics and postoperative complication rates.
- No significant differences were observed in cardiac index or vascular resistance between the groups.
- The combined cardioplegia group demonstrated significantly improved (p<0.01) and earlier recovery of left ventricular stroke work index.
Conclusions:
- Combined antegrade and retrograde cardioplegia is a safe method for myocardial protection in CABG.
- This combined approach offers superior protection, leading to enhanced left ventricular functional recovery compared to antegrade cardioplegia alone.
Abstract:
The role of retrograde coronary sinus perfusion in the preservation of ischemic myocardium is controversial. We evaluated the use of combined antegrade and retrograde cardioplegia in 59 patients undergoing coronary artery bypass surgery. Nineteen patients were administered antegrade cardioplegia, whereas 40 patients were administered antegrade plus retrograde cardioplegia. Hemodynamic data were obtained before the onset of cardiopulmonary bypass and at 1, 2, 4, 8, 16, and 24 hours after cessation of cardiopulmonary bypass. Myocardial function was assessed by measuring systemic blood pressure, heart rate, cardiac index, pulmonary artery pressure, and capillary wedge pressure. Both cohorts were similar in age, incidence of hypertension, diabetes, and previous myocardial infarction. No significant differences were noted in the need for postoperative inotropic support, the incidence of postoperative arrhythmias, myocardial infarction, heart block, or death. The two groups were similar with respect to cardiac index and systemic and pulmonary vascular resistance. However, the left ventricular stroke work index, when expressed as a function of its prebypass control value, was significantly improved (p less than 0.01) in the cohort administered combined cardioplegia. In the combined group recovery of left ventricular stroke work index occurred earlier and was more complete. These results suggest that the use of combined antegrade/retrograde cardioplegia is safe and may provide superior protection.