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Myocardial protection during aortic valve replacement. Comparison between sanguineous and Asanguineous Cardioplegic
Insights
This study compared blood cardioplegia versus electrolyte solution for aortic valve replacement. Both methods showed similar metabolic changes, suggesting reversible myocardial damage, with no clear advantage for blood cardioplegia.
Area of Science:
- Cardiovascular Surgery
- Cardiac Anesthesia
- Biochemistry
Background:
- Hypothermic potassium cardioplegia is standard for myocardial protection during cardiac surgery.
- Optimizing cardioplegia solutions is crucial for minimizing myocardial injury.
Purpose of the Study:
- To compare myocardial substrate metabolism and enzyme release between blood cardioplegia and electrolyte solution cardioplegia.
- To assess myocardial protection during isolated aortic valve replacement.
Main Methods:
- Two groups of patients undergoing aortic valve replacement: blood cardioplegia (n=15) vs. electrolyte solution (n=17).
- Analysis of arterial and coronary sinus blood for metabolic markers (lactate, pyruvate, glucose) and cardiac enzymes (CK-MB, ASAT, myoglobin).
- Monitoring of cardiac markers in peripheral venous blood for 48 hours post-procedure.
Main Results:
- Metabolic changes post-cardioplegia were similar in both groups.
- Minor differences observed in potassium, myoglobin, and creatine kinase-MB levels between groups.
- Observed cell damage was likely reversible in all patients.
Conclusions:
- Single-dose blood cardioplegia did not demonstrate a significantly superior myocardial protection compared to the electrolyte solution.
- Further research may be needed to optimize cardioplegia strategies for aortic valve replacement.
Abstract:
Myocardial substrate metabolism and enzyme release following hypothermic potassium cardioplegia were studied in two series of patients undergoing isolated aortic valve replacement. In 15 patients blood was used as cardioplegia vehicle (blood cardioplegia group) and a plain electrolyte solution was used in a control group of 17 patients. Simultaneous blood samples were drawn from arterial and coronary sinus blood before and during the first 60 min after release of aortic cross-clamping. Blood samples were analyzed for PO2. O2-saturation and content, PCO2, pH, lactate, pyruvate, glucose, potassium, myoglobin, creatine kinase (CK), its isoenzyme MB and aspartate aminotransferase (ASAT). In addition, myoglobin and enzymes were followed in peripheral venous blood for 48 hours. The pattern of metabolic changes after cardioplegia was similar in both groups, but some differences were encountered in the degree of the changes in potassium, myoglobin and CK-MB between the groups. The differences were nevertheless small and cell damage was probably of reversible nature in all patients, but the myocardial protection afforded by single dose blood cardioplegia was not unquestionably better than that of the control group.