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Updated: Sep 11, 2025

Esophageal Heat Transfer for Patient Temperature Control and Targeted Temperature Management
Published on: November 21, 2017
Risk of cardiovascular events during labor and delivery associated with acute ambient temperature changes
Jenna Kanner1, Danielle R Stevens1, Carrie J Nobles1
1Epidemiology Branch, Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, 6710B Rockledge Drive, Bethesda, MD, United States of America.
Purpose:
We assessed acute risk of cardiovascular events at labor/delivery with exposure to ambient temperatures during the week prior to delivery in a low-risk population.
Methods:
A case-crossover design evaluated 191 women with cardiovascular events at labor/delivery in the Eunice Kennedy Shriver National Institute of Child Health and Human Development Consecutive Pregnancies Study (Utah, 2002-2010). Using conditional logistic regression models, we estimated the odds ratio (OR) and 95% confidence interval (CI) for each 1 °Celsius (1.8°F) increase in the warm season (May-October) or decrease in the cold season (November-April) in the week prior to delivery compared to two weeks prior and after delivery.
Results:
Cardiovascular events during delivery included acute myocardial infarction (n = 1), stroke (n = 29), heart failure (n = 7), cardiac arrest (n = 118), and unspecified (n = 39). Cardiovascular event risk increased by 9% (95% CI: 1.02, 1.18) for every 1 °C increase in average temperature in the week prior to delivery during the warm season and increased 6% (95% CI: 1.00, 1.13) for every 1 °C decrease during the cold season.
Conclusion:
Acute temperature changes in the week prior to delivery were associated with increased risk of cardiovascular events at labor/delivery.
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