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ENDOTHELIAL-DEPENDENT VASCULAR REACTIVITY AFTER CARDIOPULMONARY BYPASS IS ASSOCIATED WITH UNIQUE METABOLOMIC
Ryan J Stark1, Alexandra C Schrimpe-Rutledge2, Simona G Codreanu2
1Division of Pediatric Critical Care Medicine, Vanderbilt University Medical Center, Nashville, Tennessee.
Shock (Augusta, Ga.)
|August 23, 2024
Summary
Cardiopulmonary bypass (CPB) alters arginine and purine metabolism, impacting vascular function in pediatric heart surgery patients. This study links specific metabolites like acetylcarnitine and glutamine to vascular responses during CPB.
Area of Science:
- Biochemistry
- Physiology
- Pediatric Cardiology
Background:
- Cardiopulmonary bypass (CPB) is essential for complex congenital heart defect surgeries.
- CPB induces inflammation and alters cellular metabolism, affecting vascular function.
- Understanding these metabolic shifts is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the link between temporal metabolomics and vascular function during CPB.
- To identify specific metabolites altered by CPB and their association with vascular reactivity.
- To provide insights into the metabolic landscape of pediatric patients undergoing CPB.
Main Methods:
- Utilized laser Doppler perfusion monitoring and iontophoresis in pediatric patients.
- Performed untargeted metabolomics on plasma samples collected during CPB.
- Correlated metabolic profiles with endothelial-dependent (acetylcholine) and endothelial-independent (sodium nitroprusside) vascular responses.
Main Results:
- Identified 2,404 unique metabolic features in plasma during CPB.
- Arginine biosynthesis metabolites were significantly altered by CPB.
- Purine metabolism consistently correlated with vascular responses; acetylcarnitine and glutamine showed specific associations.
Conclusions:
- CPB significantly alters the metabolic profile in pediatric cardiac surgery patients.
- Metabolites, particularly those in purine and arginine pathways, are linked to altered vascular function post-CPB.
- These findings offer a deeper understanding of metabolic derangements and their physiological consequences in this population.
