The newborn infant's thermal environment in the delivery room when skin-to-skin care has to be interrupted

Hats Off for Full-Term Healthy Newborns: No Benefits for Thermoregulation

BACKGROUND

Hyperthermia is a known risk for sudden unexpected infant death. The practice of hat placement at birth to prevent transient hypothermia may not be necessary and sets an early standard for clothing infants that may lead to hyperthermia postnatally.

OBJECTIVE

To examine the elimination of hats on thermoregulation (eg, hypothermia, <97.6°F) in full-term newborns with no abnormalities within 24 hours of birth.

METHODS

In 2018, an institution guideline discontinued the use of hats at birth. Subsequently, newborn body temperatures were respectively extracted from electronic health records and data were compared from 482 infants (>38 weeks' gestation and newborn birth weight >2500 g) prior to ( n = 257) and following ( n = 225) the practice change. Body temperatures prior to and after the practice change to eliminate hats use were compared.

RESULTS

No statistically significant difference was observed: (1) in the proportion of infants experiencing hypothermia with or without hat use, respectively, 23.7% compared with 31.1% ( P = .09) and (2) in the odds of an infant experiencing hypothermia when adjusting for relevant covariates (odds ratio = 1.44; 95% confidence interval 0.89-2.32; P = .14).

CONCLUSIONS

Our findings demonstrate that the use of hats on infants at birth had no measurable impact on newborn thermoregulation.

Optimising homeothermy in neonates: a systematic review and clinical guidelines from the French Neonatal Society

AIM

Thermal instability is harmful on the newborn infant. We sought to draw up practical guidelines on maintaining homeothermy alongside skin-to-skin contact.

METHODS

A systematic analysis of the literature identified relevant studies between 2000 and 2021 in the PubMed database. Selected publications were evaluated, and their level of evidence were graded, in order to underpin the development of clinical guidelines.

RESULTS

We identified 7 meta-analyses and 64 clinical studies with a focus on newborn infants homeothermy. Skin-to-skin contact is the easiest and most rapidly implementable method to prevent body heat loss. Alongside skin-to-skin contact, monitoring the newborn infant's body temperature with a target of 37.0°C is essential. For newborn infants <32 weeks of gestation, a skullcap and a polyethylene bag should be used in the delivery room or during transport. To limit water loss, inhaled gases humidification and warming is recommended, and preterm infants weighing less than 1600 g should be nursed in a closed, convective incubator. With regard to incubators, there are no clear benefits for single vs. double-wall incubators as well as for air vs. skin servo control.

CONCLUSION

Alongside skin-to-skin contact, a bundle of practical guidelines could improve the maintenance of homeothermy in the newborn infant.

Association between hypothermia in the first day of life and survival in the preterm infant

OBJECTIVE

Hypothermia is associated with elevated mortality in the preterm infant. The preterm infant's thermoregulatory capacity is limited, and the thermal environment in an incubator is often perturbed by nursing procedures. We evaluated the incidence of a postnatal low body temperature and hypothermia in preterm infants and its association with mortality.

METHODS

We measured the lowest body temperature during the first 24h of life (T_{Body Nadir 24h}) and hypothermia (T_{Body Nadir 24h}<36.0°C) in preterm infants (gestational age: 23⁰-31⁶ weeks) in a neonatal intensive care unit. Prenatal and neonatal characteristics associated with mortality were identified in univariate and multivariable analyses.

RESULTS

A total of 102 preterm infants were included, with a mean gestational age at birth of 28.4±2.3 weeks. The incidence of hypothermia during the first 24h was 53%. A Cox multivariate regression model indicated that T_{Body Nadir 24h} (hazard ratio (HR) [95% confidence interval]: 0.57 [0.36-0.90]; P=0.017), gestational age (0.62 [0.50-0.76]; P<0.001), and amine use (4.55 [2.01-10.28]; P=0.001) were significantly associated with mortality. When considering a threshold for T_{Body Nadir 24h}, a value of 35.0°C had the highest HR (3.30 [1.42-7.68]; P<0.01).

CONCLUSION

In preterm infants, the incidence of hypothermia during the first 24h of life was 53%. T_{Body Nadir 24h} had an influence on mortality, independently of other factors (notably birth weight and amine use). Within the framework of a quality improvement strategy, the implementation of a thermoregulation bundle is required to prevent hypothermia and decrease mortality in preterm infants.