Key result
During normal pregnancy, heart rate and shock index increased until gestational week 32, while systolic blood pressure and double product negatively correlated with minimum outside temperature.
Observational (n=425)
Normal pregnancy is associated with specific longitudinal changes in hemodynamic parameters that are also influenced by seasonal temperature variations.
May warrant seasonal adjustment in pregnancy BP monitoring; hypothesis-generating and requires prospective confirmation before practice change.
Although there are some reports that low plasma volume or increased cardiac output is associated with developing preeclampsia, there are few reports of daily serial hemodynamic data during pregnancy. A total of 37,092 home blood pressure (BP) and heart rate (HR) measurements were obtained from 425 normal pregnant women. Heart rate and shock index (SI) gradually increased by gestational week 32 and then decreased, whereas double product (DP) increased linearly during pregnancy. Although systolic BP and DP were consistently and negatively correlated with daily minimum outside temperature, HR and SI were positively correlated with minimum outside temperature in summer.
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Metoki et al. (2012) conducted an observational in Normal pregnancy (n=425). Seasonal variation (minimum outside temperature) was evaluated on Hemodynamic changes (HR, SI, DP, BP) and correlation with temperature. During normal pregnancy, heart rate and shock index increased until gestational week 32, while systolic blood pressure and double product negatively correlated with minimum outside temperature.
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