Changes in metabolic acidosis following birth in intensive care unit neonates.

Autor: Simon NT; Department of Obstetrics and Gynecology, University of Colorado Anschutz Medical Campus, 12700 East 19th Avenue, Aurora, CO 80045, USA., Hagan PM; Division of Neonatology, Department of Pediatrics, Denver Health Medical Center, 777 Bannock St, Denver, CO 80204, USA., Rockhill KM; Rocky Mountain Poison & Drug Safety (RMPDS), Denver Health Medical Center, 1391 Speer Boulevard, Suite 600, Denver, CO 80204, USA., Heyborne KD; Department of Obstetrics and Gynecology, University of Colorado Anschutz Medical Campus, 12700 East 19th Avenue, Aurora, CO 80045, USA; Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Denver Health Medical Center, 777 Bannock St, Denver, CO 80204, USA. Electronic address: kent.heyborne@dhha.org.
Jazyk: angličtina
Zdroj: European journal of obstetrics, gynecology, and reproductive biology [Eur J Obstet Gynecol Reprod Biol] 2024 Jun; Vol. 297, pp. 161-168. Date of Electronic Publication: 2024 Apr 20.
DOI: 10.1016/j.ejogrb.2024.04.025
Abstrakt: Background: Little is known about how and why metabolic acidosis changes within the first six hours of life in intensive care unit neonates.
Objective: To determine changes in pH and base excess between paired umbilical cord arterial and neonatal arterial blood samples during the first 6 h of life, to identify factors associated with the direction and magnitude of change, and to examine morbidity and mortality in newborns with acidosis at birth or as neonates.
Study Design: Retrospective cohort study of all deliveries from a single institution between 2016-2020 with paired umbilical cord arterial and neonatal arterial samples obtained within 6 h of life meeting rigorous criteria to ensure sample integrity. The primary outcomes were the direction and magnitude of change of pH and base excess. Multiple factors were assessed for possible correlation with pH and base excess change. The secondary outcome was the association between a composite outcome of death or cerebral palsy and pathologic acidosis (pH ≤ 7.1) at birth or as a neonate.
Results: 102 patients met inclusion criteria. Newborn arterial gasses were obtained at a median of 1.5 h (74 % < 2 h). pH improved in 71 % of cases and worsened in 29 %, and base excess improved in 52 % and worsened in 48 %, with wide observed ranges in both parameters. The paired pH and base excess values were moderately (r = 0.38) and strongly (r = 0.63) positively correlated, respectively, but were not correlated with time since birth (r = 0.14). Low birth weight, prematurity or respiratory failure were associated with worsening or less improvement, while worse initial acidosis was associated with greater improvement. Death or survival with cerebral palsy was more common with pathologic acidosis in either cord or newborn sample as compared with those without acidosis (27.3 % vs 3.7 %, p = 0.003), and was more common in those with isolated neonatal acidosis as compared to those without acidosis (50 % vs 3.7 %, p = 0.016).
Conclusions: Changes in pH and base excess occurred over a wide range between delivery and the first newborn blood gas in the first 6 h of life, and we identified several factors associated with direction of change. Metabolic acidosis at birth cannot reliably be inferred from neonatal arterial values. Neonatal acidosis, including acidosis following a normal pH and base excess at birth, was associated with morbidity and mortality.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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