Temperature, placental abruption and stillbirth

Rammah, Amal; Whitworth, Kristina W.; Han, Inkyu; Chan, Wenyaw; Hess, Judy Wendt; Symanski, Elaine

doi:10.1016/j.envint.2019.105067

Cited by 41 publications

(61 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In meta-analysis, stillbirths increased by 1.05 (95% confidence interval 1.01 to 1.08) per 1°C rise in temperature, by 1.24-fold (1.12 to 1.36) at lags measured on individual days in the last week of pregnancy,6282 and by 3.39-fold (2.33 to 4.96) when temperature effects were examined over a trimester or the whole pregnancy period6182 (supplementary figs 5 and 6). In subgroup analyses, point estimates of associations between heat and stillbirth were higher in term than in preterm stillbirths,82 in black and Hispanic women than white women,83 in younger women,84 male fetuses, and had reduced over time61 (fig 5, fig 6, and supplementary fig 8b). Only one study provided information on multiple pregnancies, reporting associations similar to those with singleton pregnancies 82.…”

Section: Resultsmentioning

confidence: 98%

Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: systematic review and meta-analysis

Chersich

Pham

Areal

et al. 2020

BMJ

260

284

View full text Add to dashboard Cite

Objective To assess whether exposure to high temperatures in pregnancy is associated with increased risk for preterm birth, low birth weight, and stillbirth. Design Systematic review and random effects meta-analysis. Data sources Medline and Web of Science searched up to September 2018, updated in August 2019. Eligibility criteria for selecting studies Clinical studies on associations between high environmental temperatures, and preterm birth, birth weight, and stillbirths. Results 14 880 records and 175 full text articles were screened. 70 studies were included, set in 27 countries, seven of which were countries with low or middle income. In 40 of 47 studies, preterm births were more common at higher than lower temperatures. Exposures were classified as heatwaves, 1°C increments, and temperature threshold cutoff points. In random effects meta-analysis, odds of a preterm birth rose 1.05-fold (95% confidence interval 1.03 to 1.07) per 1°C increase in temperature and 1.16-fold (1.10 to 1.23) during heatwaves. Higher temperature was associated with reduced birth weight in 18 of 28 studies, with considerable statistical heterogeneity. Eight studies on stillbirths all showed associations between temperature and stillbirth, with stillbirths increasing 1.05-fold (1.01 to 1.08) per 1°C rise in temperature. Associations between temperature and outcomes were largest among women in lower socioeconomic groups and at age extremes. The multiple temperature metrics and lag analyses limited comparison between studies and settings. Conclusions Although summary effect sizes are relatively small, heat exposures are common and the outcomes are important determinants of population health. Linkages between socioeconomic status and study outcomes suggest that risks might be largest in low and middle income countries. Temperature rises with global warming could have major implications for child health. Systematic review registration PROSPERO CRD 42019140136 and CRD 42018118113.

show abstract

Section: Resultsmentioning

confidence: 98%

Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: systematic review and meta-analysis

Chersich

Pham

Areal

et al. 2020

BMJ

260

284

View full text Add to dashboard Cite

show abstract

“…Nevertheless, at least four studies have reported associations between stillbirth and higher temperatures during the week before delivery for warm-weather births 25 , 26 , 27 , 28. The most recent, led by Symanski, looked at 708 pregnant women in the Houston metropolitan area and found that from May through September, each 10°F increase in apparent temperature in the week preceding delivery was associated with a 45% increase in stillbirth, relative to baseline risk 25. Furthermore, the Texas investigation found that associations between stillbirth and high summer temperatures appeared to be limited to Hispanic and non-Hispanic black women, with no association seen in non-Hispanic white women 25…”

Section: Stillbirthsmentioning

confidence: 99%

Taking the Heat: Potential Fetal Health Effects of Hot Temperatures

Konkel¹

2019

Environ Health Perspect

View full text Add to dashboard Cite

“…Rammah et al, (2019), conducted a study to examine associations between increases of apparent temperature and stillbirths during the warm season (May–September), among 708 women, from 6 days before stillbirth, in Harris County, Texas, from 2008 to 2013. The results showed that a 10 °F increase in apparent temperature in the week before delivery was related to a 45 % increased risk of stillbirth (adjusted OR = 1.45, 95 % confidence interval (CI): 1.18, 1.77) [ 7 ]. Likewise, another study in California showed for every 10 °F increase in apparent temperature during the warm season, the risk of stillbirth increased by 10.4 % after 2–6 days lag, while there was no significant relation between temperature and stillbirth during the cold season [ 10 ].…”

Section: Discussionmentioning

confidence: 99%

“…But, other studies have reported a positive relation between exposure to heat waves in all months of pregnancy and preterm birth, while exposure during early pregnancy was more likely to increase the risk of stillbirth, compared with exposure in the last months of pregnancy [ 6 ]. Several studies have reported associations between stillbirth and higher temperatures during the week before delivery [ 7 – 10 ]. Other studies have shown the effect of high temperatures on preterm birth [ 11 ], gestational diabetes mellitus [ 12 ] and birth weight [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Association between Physiological Equivalent Temperature (PET) with adverse pregnancy outcomes in Ahvaz, southwest of Iran

Dastoorpoor

Khanjani

Khodadadi

2021

BMC Pregnancy Childbirth

View full text Add to dashboard Cite

Background There are few epidemiological studies on the relation between temperature changes and adverse pregnancy outcomes. The purpose of this study was to determine the relation between Physiological Equivalent Temperature (PET) with adverse pregnancy outcomes including stillbirth, low birth weight (LBW), preterm labor (PTL), spontaneous abortion (SA), preeclampsia and hypertension in Ahvaz, Iran. Methods Distributed Lag Non-linear Models (DLNM) combined with quasi-Poisson regression were used to investigate the effect of PET on adverse pregnancy outcomes. In this study the effect of time trend, air pollutants (NO2, SO2 and PM10), and weekdays were adjusted. Results High PET (45.4 C°, lag = 0) caused a significant increase in risk of stillbirth. Also, high levels of PET (45.4, 43.6, 42.5 C°, lag = 0–6) and low levels of PET (9.9, 16.9 C°, lags = 0, 0–13, 0–21) significantly increased the risk of LBW. But, low levels of PET (6.4, 9.9, 16.9 C°, lags = 0–6, 0–13) reduced the risk of gestational hypertension. Conclusion The results of this study showed that hot and cold thermal stress may be associated with increased risk of stillbirth, and LBW in Ahvaz.

show abstract

Temperature, placental abruption and stillbirth

Cited by 41 publications

References 32 publications

Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: systematic review and meta-analysis

Associations between high temperatures in pregnancy and risk of preterm birth, low birth weight, and stillbirths: systematic review and meta-analysis

Taking the Heat: Potential Fetal Health Effects of Hot Temperatures

Association between Physiological Equivalent Temperature (PET) with adverse pregnancy outcomes in Ahvaz, southwest of Iran

Contact Info

Product

Resources

About