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Extensive myocardial revascularization--influence of cardioplegia on operative results
Insights
Cold cardioplegia significantly reduces early cardiac death and perioperative myocardial infarction in patients undergoing extensive myocardial revascularization compared to intermittent hypothermic aortic occlusion. This technique is crucial for complete revascularization in diffuse coronary artery disease.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Cardiology
Background:
- Extensive myocardial revascularization, defined as 5 or more distal anastomoses, presents unique challenges in diffuse coronary artery disease.
- Myocardial preservation strategies are critical to minimize perioperative complications during complex coronary artery bypass grafting (CABG).
Purpose of the Study:
- To compare the outcomes of extensive myocardial revascularization using intermittent hypothermic aortic occlusion versus cold cardioplegia.
- To evaluate the safety and efficacy of different myocardial protection methods in patients with complex coronary artery disease.
Main Methods:
- Retrospective review of 138 patients undergoing extensive myocardial revascularization over one year.
- Two groups were compared: intermittent hypothermic aortic occlusion (n=68) and cold cardioplegia (n=70).
- Patient demographics, coronary artery disease extent, and preoperative left ventricular function were similar between groups.
Main Results:
- The cold cardioplegia group experienced significantly lower early postoperative mortality (0% vs. 7.4%, p=0.02).
- Incidence of perioperative myocardial infarction and need for postoperative catecholamines were reduced in the cardioplegia group (p=0.04 and p<0.01, respectively).
- Determinants of catecholamine requirement differed: aortic cross-clamp time in the non-cardioplegia group, and preoperative left ventricular end-diastolic pressure in the cardioplegia group.
Conclusions:
- Cold cardioplegia is associated with improved early outcomes, including reduced mortality and perioperative infarction, in extensive myocardial revascularization.
- A strategy of complete revascularization in diffuse coronary artery disease is best supported by the use of cold cardioplegia for myocardial preservation.
Abstract:
Experience with extensive myocardial revascularization (5 or more distal anastomoses) during a one-year period is reviewed. Intermittent hypothermic aortic occlusion was used in 68 patients (non-cardioplegia group), and cold cardioplegia in 70 patients. The 2 groups were similar in regard to age, sex, extension of coronary artery disease, number of previous myocardial infarctions, preoperative diagnosis of impending myocardial infarction and preoperative left ventricular function. Five patients in the non-cardioplegia group died early postoperatively, while no cardiac death occurred in the cardioplegia group (p = 0.02). The incidence of perioperative infarction and postoperative catecholamine requirement was lower in the cardioplegia group (p-values 0.04 and < 0.01 respectively). The major determinant of the postoperative catecholamine requirement in the non-cardioplegia group was the total aortic cross-clamp time, while in the cardioplegia group it was the preoperative left ventricular end-diastolic pressure. A policy of "complete revascularization" in diffuse coronary artery disease seems to be justified only if cold cardioplegia is used for myocardial preservation.