Extreme heat episodes and risk of preterm birth in California, 2005–2013

Ilango, Sindana D.; Weaver, Meschelle; Sheridan, Paige; Schwarz, Lara; Clemesha, Rachel E. S.; Bruckner, Tim A.; Basu, Rupa; Gershunov, Alexander; Benmarhnia, Tarik

doi:10.1016/j.envint.2020.105541

Cited by 36 publications

(51 citation statements)

References 30 publications

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“…Overall, we observed positive relationships between preterm birth and heat exposure in the third week. Based on previous studies, heat-induced stress usually resulted from internal heat production, lack of capacity for heat loss in the environment, and environmental heat load (Dadvand et al 2011;Ilango et al 2020). A study by Sun et al (2019) demonstrated that days of extreme heat, but not extreme cold, are associated with a higher risk of preterm birth in the contiguous US (Sun et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Exposure to suboptimal ambient temperature during specific gestational periods and adverse outcomes in mice

Mayvaneh

Entezari

Sadeghifar

et al. 2020

Environ Sci Pollut Res

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Exposure to suboptimal ambient temperature during pregnancy has been reported as a potential teratogen of fetal development. However, limited animal evidence is available regarding the impact of extreme temperatures on maternal pregnancy and the subsequent adverse pregnancy outcomes. Our objective in this study is to investigate the relationship between temperature and maternal stress during pregnancy in mice. This study used the Naval Medical Research Institute (NMRI) mice during the second and third pregnant weeks with the gestational day (GD) (GD 6.5-14.5 and GD 14.5-17.5). Mice were exposed to suboptimal ambient temperature (1°C, 5°C, 10°C, 15°C, 40°C, 42°C, 44°C, 46°C, and 48°C for the experimental group and 23°C for the control group) 1 h per day, 7 days a weekin each trimester. Measurements of placental development (placental weight [PW] and placental diameter [PD]) and fetal growth (fetal weight [FW] and crown-to-rump length [CRL]) between experimental and control groups were compared using analysis of variance (ANOVA). Data on the occurrence of preterm birth (PTB) and abnormalities were also collected. The results showed that exposure to both cold and heat stress in the second and third weeks of pregnancy caused significant decreases in measurements of placental development (PW and PD) and fetal growth (FW and CRL). For all temperature exposures, 15°C was identified as the optimal temperature in the development of the embryo. Most PTB occurrences were observed in high-temperature stress groups, with the highest PTB number seen in the exposure group at 48°C, whereas PTB occurred only at 1°C among cold stress groups. In the selected exposure experiments, an approximate Ushaped relation was observed between temperature and number of abnormality occurrence. The highest percentage of these anomalies occurred at temperatures of 1°C and 48°C, while no abnormalities were observed at 15°C and in the control group. Our findings strengthened the evidence that exposure to suboptimal ambient temperatures may trigger adverse pregnancy outcomes and worsen embryo and fetal development in mice.

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Section: Discussionmentioning

confidence: 99%

Exposure to suboptimal ambient temperature during specific gestational periods and adverse outcomes in mice

Mayvaneh

Entezari

Sadeghifar

et al. 2020

Environ Sci Pollut Res

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“…Nine studies employed apparent temperature (combined effect of air temperature and relative humidity) to identify the exposure effects on elevated ambient temperatures on pregnant women and neonates [11,12,[32][33][34][35][36][37][38]. Twelve studies examined the effects of heatwaves/extreme heat events on maternal, foetal, and neonatal outcomes [6,32,[38][39][40][41][42][43][44][45][46][47]. They used different heatwave characteristics, i.e., length of exposure, threshold percentile (75th, 90th, 95th, and 98th percentile to identify high temperatures), peak temperature, and a number of heatwaves/heat events, to estimate the magnitude of the exposure effects [6,32,[38][39][40][41][42][43][44][45][46][47].…”

Section: The Magnitude Characteristics and Trends Of Research On Elev...mentioning

confidence: 99%

Effect of Elevated Ambient Temperature on Maternal, Foetal, and Neonatal Outcomes: A Scoping Review

Dalugoda

Kuppa

Phung

et al. 2022

IJERPH

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This scoping review provides an overview of the published literature, identifies research gaps, and summarises the current evidence of the association between elevated ambient temperature exposure during pregnancy and adverse maternal, foetal, and neonatal outcomes. Following the PRISMA extension for scoping reviews reporting guidelines, a systematic search was conducted on CINAHL, PubMed, and Embase andincluded original articles published in the English language from 2015 to 2020 with no geographical limitations. A total of seventy-five studies were included, conducted across twenty-four countries, with a majority in the USA (n = 23) and China (n = 13). Study designs, temperature metrics, and exposure windows varied considerably across studies. Of the eighteenheat-associated adverse maternal, foetal, and neonatal outcomes identified, pre-term birth was the most common outcome (n = 30), followed by low birth weight (n = 11), stillbirth (n = 9), andgestational diabetes mellitus (n = 8). Overall, papers reported an increased risk with elevated temperature exposures. Less attention has been paid to relationships between heat and the diverse range of other adverse outcomes such as congenital anomalies and neonatal mortality. Further research on these less-reported outcomes is needed to improve understanding andthe effect size of these relationships with elevated temperatures, which we know will be exacerbated by climate change.

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“…There is growing research into the extent to which seasonality and environmental shocks such as heat waves may trigger PTB including systematic reviews by Olah et al and by Zhang et al [16,17] that show a general pattern of association between heat waves and PTB (along with still birth and low birth weight), but highlight a heterogeneity of measures and outcomes. Further studies showing a positive correlation between heat and PTB were conducted in China, Australia, Spain, the United States, Israel, and Italy [13,[18][19][20][21][22][23][24][25][26][27][28]. Other studies, in the United States, Germany, Canada, and the United Kingdom, however, found no association [29][30][31][32] or even found a protective effect [33].…”

Section: Introductionmentioning

confidence: 96%

Association of Summer Heat Waves and the Probability of Preterm Birth in Minnesota: An Exploration of the Intersection of Race and Education

Smith

2020

IJERPH

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Preterm birth (PTB) is common and has negative impacts on infant health. While some maternal risk factors have been identified, including age under 20 or over 40, substance abuse, low BMI, and racism, less is known about the impact of environmental exposures like high heat. We combined 154,157 records of live births occurring in Minnesota between 2009 and 2015 with hourly weather records collected from the Minneapolis–St. Paul airport. We tested if maternal heat wave exposure (a seven-day period with a mean daily high temp of 37 °C) immediately prior to birth leads to a higher risk of preterm birth. Additional covariates included maternal age, race/ethnicity, educational status, and residence in the seven-county Minneapolis–St. Paul metro area. Pregnant women exposed to a seven-day heat wave of 37 °C or higher experienced a higher relative risk of PTB compared to women who did not experience a heat wave (1.14 risk ratio (RR), 1.0–1.3 95% confidence interval (CI)). The result is robust to controls for a woman’s age, race/ethnicity, educational attainment, place of residence, and year of the birth. Children born to Black women with college degrees who are exposed to heat waves experience a higher relative risk of PTB compared to White women with college degrees in a heat wave (2.97 RR, 1.5–6.1 95% CI). Summer heat waves are associated with higher risk of PTB in late-term pregnancies in Minnesota.

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Extreme heat episodes and risk of preterm birth in California, 2005–2013

Cited by 36 publications

References 30 publications

Exposure to suboptimal ambient temperature during specific gestational periods and adverse outcomes in mice

Exposure to suboptimal ambient temperature during specific gestational periods and adverse outcomes in mice

Effect of Elevated Ambient Temperature on Maternal, Foetal, and Neonatal Outcomes: A Scoping Review

Association of Summer Heat Waves and the Probability of Preterm Birth in Minnesota: An Exploration of the Intersection of Race and Education

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