Background
Ambient heat exposure during pregnancy is associated with adverse outcomes, and adverse neurodevelopmental outcomes are an emerging concern. This scoping review synthesises human and animal evidence on the association between prenatal ambient heat exposure and poor neurodevelopmental outcomes.
Methods
A search was conducted across MEDLINE, Global Health, Web of Science, PsycINFO, and CINAHL. Studies up until May 2025, examining prenatal ambient heat exposure and neurodevelopmental outcomes such as congenital malformations and mental health conditions, were included. Two reviewers independently screened and extracted in duplicate using Covidence. Studies were categorised based on short-term or long-term outcomes.
Results
The search yielded 8189 studies, with 58 meeting the inclusion criteria (17 human, 41 animal). Animal evidence was primarily based on rodents (n = 32) exposed to extreme heat that caused hyperthermia. Human studies were methodologically diverse, yielding inconsistent results. There was robust evidence to suggest an increased risk of central nervous system (CNS) malformations and a reduction in brain weight in animal studies. However, evidence from the small number of human studies was inconclusive. For long-term outcomes, such as mental health (n = 11), both human and animal studies were limited but generally reported adverse outcomes.
Conclusion
Overall, the evidence suggests a potential link between prenatal heat exposure, CNS malformations and altered brain size in animal models; however, the implications for humans remain uncertain. Human studies were scarce and inconsistent in their approaches. Future animal studies should employ realistic heat exposures to improve human applicability, and human studies should utilise consistent outcomes and exposure measures.
扫码关注我们
求助内容:
应助结果提醒方式:
