Abstract
Background
Infants with single ventricle heart disease (SVHD) suffer morbidity from insufficient pulmonary blood flow, which may be related to impaired arginine metabolism. No prior study has reported quantitative mapping of arginine metabolites to evaluate the relationship between circulating metabolite levels and outcomes.
Methods
Prospective cohort study of 75 SVHD cases peri-Stage 2 and 50 healthy controls. We targeted pre- and post-op absolute serum quantification of 9 key members of the arginine metabolism pathway by tandem mass spectrometry. Primary outcomes were length of stay (LOS) and post-Stage 2 hypoxemia.
Results
Pre-op cases showed alteration in 6 metabolites including decreased arginine and increased asymmetric dimethyl arginine (ADMA) levels compared to controls. Post-op cases demonstrated decreased arginine and citrulline levels persisting through 48 h. Adjusting for clinical variables, lower pre-op and 2 h post-op concentrations of multiple metabolites, including arginine and citrulline, were associated with longer post-op LOS (p < 0.01). Increased ADMA at 24 h was associated with greater post-op hypoxemia burden (p < 0.05).
Conclusion
Arginine metabolism is impaired in interstage SVHD infants and is further deranged following Stage 2 palliation. Patients with greater metabolite alterations experience greater post-op morbidity. Decreased arginine metabolism may be an important driver of pathology in SVHD.
Impact
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Interstage infants with SVHD have significantly altered arginine-nitric oxide metabolism compared to healthy children with deficiency of multiple pathway intermediates persisting through 48 h post-Stage 2 palliation.
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After controlling for clinical covariates and classic catheterization-derived predictors of Stage 2 readiness, both lower pre-operation and lower post-operation circulating metabolite levels were associated with longer post-Stage 2 LOS while increased post-Stage 2 ADMA concentration was associated with greater post-op hypoxemia.
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Arginine metabolism mapping offers potential for development using personalized medicine strategies as a biomarker of Stage 2 readiness and therapeutic target to improve pulmonary vascular health in infants with SVHD.
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Data availability
The datasets analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This study was supported by the American Heart Association - AHA 20CDA35310498 (Frank) and AHA18IPA34170070 (Davidson), the National Institutes of Health - NIH/NCATS Colorado CTSA, No. UL1 TR001082 and UL1 TR002535, NIH/NHLBI K23HL123634 (Frank), and R01HL156936 (Davidson), and the Jayden DeLuca Foundation. There was no relationship with industry associated with this manuscript.
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B.F. wrote the first draft. B.F. and J.D. created the original study design. D.N. performed the statistical analysis. D.N., L.K., M.M., G.M., M.T., M.D. and J.D. assisted with study operations, analyzed the data, and edited the manuscript. All authors have approved the final version and agree to take accountability for the submission.
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Frank, B.S., Niemiec, S., Khailova, L. et al. Arginine-NO metabolites are associated with morbidity in single ventricle infants undergoing stage 2 palliation. Pediatr Res (2024). https://doi.org/10.1038/s41390-024-03162-y
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DOI: https://doi.org/10.1038/s41390-024-03162-y