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Heat stress prior is associated with an increased placental perfusion and lower peripheral resistance of the uterine artery. Logarithmized pulsatility index (logPI) of the umbilical (a) and uterine (b) artery from heat-exposed and non-heat-exposed pregnant women, measured by ultrasound assessment (n = 386). Representative ultrasound images of high (c) and low PI (d), examined at GA 34–36. Scatter-plots represent median + IQR; unpaired t-test.
