Management and Clinical Outcomes of Neonatal Hypothermia in the Newborn Nursery.

Abstract

Objectives: Neonatal hypothermia has been shown to be commonly detected among late preterm and term infants. In preterm and very low birth weight infants, hypothermia is associated with increased morbidity and mortality. Little is known about the clinical interventions and outcomes in hypothermic late preterm and term infants. This study fills this gap in the evidence.

Methods: Single-center retrospective cohort study using electronic health record data on infants ≥35 weeks' gestation admitted to a newborn nursery from 2015 to 2021. Hypothermia was categorized by severity: none, mild (single episode, 36.0-36.4°C), and moderate or recurrent (<36.0°C and/or 2+ episodes lasting at least 2 hours). Bivariable and multivariable logistic regression examined associations between hypothermia and interventions or outcomes. Stratified analyses by effect modifiers were conducted when appropriate.

Results: Among 24 009 infants, 1111 had moderate or recurrent hypothermia. These hypothermic infants had higher odds of NICU transfer (adjusted odds ratio [aOR] 2.10, 95% confidence interval [CI] 1.68-2.60), sepsis evaluation (aOR 2.23, 95% CI 1.73-2.84), and antibiotic use (aOR 1.73, 95% CI 1.15-2.50) than infants without hypothermia. No infants with hypothermia had culture-positive sepsis, and receipt of antibiotics ≥72 hours (surrogate for culture-negative sepsis and/or higher severity of illness) was not more common in hypothermic infants. Hypothermic infants also had higher odds of blood glucose measurement and hypoglycemia, slightly higher percent weight loss, and longer lengths of stay.

Conclusions: Late preterm and term infants with hypothermia in the nursery have potentially unnecessary increased resource utilization. Evidence-based and value-driven approaches to hypothermia in this population are needed.