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Purines, lactate and phosphate release from child and adult heart during cardioplegic arrest
R T Smolenski1, J Swierczyński, M Narkiewicz
1Department of Biochemistry, Academic Medical School, Gdańsk, Poland.
Insights
Children undergoing cardiac surgery experience more severe metabolic injury to the heart during cardioplegic arrest than adults. This is evidenced by significantly higher release of lactate, phosphate, and purine catabolites in pediatric patients.
Area of Science:
- Cardiology
- Biochemistry
- Pediatric Surgery
Background:
- Cardiac surgery often requires cardioplegic arrest to protect the heart.
- Metabolic byproducts released from the heart can indicate the extent of cellular injury.
- Understanding age-related differences in metabolic response is crucial for optimizing cardiac protection strategies.
Purpose of the Study:
- To compare the release of metabolic catabolites (lactate, phosphate, purines) from adult and pediatric hearts during cardioplegic arrest.
- To assess the severity of metabolic injury in children versus adults following cardiac surgery.
Main Methods:
- Collection of coronary effluent during sequential cardioplegic solution infusions in adult and pediatric patients undergoing cardiac surgery.
- Quantification of lactate, phosphate, and purine catabolites (adenosine, inosine, hypoxanthine) in the coronary effluent.
- Analysis of release rates in relation to the timing and frequency of cardioplegic infusions.
Main Results:
- A significant increase in lactate, phosphate, and purine release was observed during subsequent cardioplegic infusions in both adults and children.
- Pediatric hearts exhibited 1.5-2.5 times higher release rates of these metabolites during the second infusion and 3-7 times higher during the third infusion compared to adult hearts.
- These higher release rates in children occurred despite more frequent cardioplegic infusions.
Conclusions:
- The elevated release of lactate, phosphate, and purines indicates more severe metabolic injury in pediatric hearts compared to adult hearts during cardioplegic arrest.
- These findings highlight a critical age-dependent difference in myocardial response to metabolic stress during cardiac surgery.
- Further research into age-specific cardioplegia protocols may be warranted to mitigate metabolic injury in children.
Abstract:
The release of lactate, phosphate and purine catabolites from the heart in adult and children undergoing cardiac surgery was recorded. The compounds were determined in the coronary effluent collected during subsequent infusions of cardioplegic solution into the coronary root. As compared to the infusion just after onset of ischemia, both in adults and children manifold increase of the release was observed during subsequent infusions. The rates of release of lactate, phosphate and purines (adenosine + inosine + hypoxanthine) were 1.5 to 2.5 times higher in children than in adult hearts during the second cardioplegic infusion and 3 to 7 times higher during the third cardioplegic infusion in spite of a more frequent infusion of cardioplegic solution in children. A much greater increase of the release of lactate, phosphate and purines provides evidence for more severe metabolic injury during cardioplegic arrest to the heart in children than in adults.