The prediction of hypertensive disorders by maternal hemodynamic assessment in the first trimester of pregnancy

Background: Hypertensive disorders of pregnancy and fetal growth restriction share common etiopathological origins and could be caused by maternal hemodynamic maladaptation to pregnancy. Objective: The aim of our study is to evaluate if there is a correlation between maternal hemodynamic detected by UltraSonic Cardiac Output Monitor (USCOM (R)) during the first trimester and the pregnancy outcome. Study design: We recruited a nonconsecutive series of women in the first trimester of pregnancy with no previous history of hypertensive disorders. We measured the pulsatility index uterine arteries and performed a hemodynamic evaluation by USCOM (R) device. After delivery, we reported the development of hypertensive disorders or intrauterine fetal growth restriction later during gestation. Results: A total of 187 women were enrolled during the first trimester; 17 (9%) developed gestational hypertension or preeclampsia while 11 (6%) delivered a restricted growth fetus. Mean uterine artery pulsatility index above the 95th percentile was significantly more frequent in both women who developed hypertension and those with fetal growth restriction compared to controls. Hemodynamic parameters (reduced cardiac output and increased total vascular resistance) were significantly different in the group that developed hypertensive disorders, compared to uncomplicated pregnancy. ROC curves demonstrated the usefulness of uterine artery pulsatility index in the prediction of fetal growth restriction, while hemodynamic parameters were significantly associated to the development of hypertensive disorders. Conclusions: Hemodynamic maladaptation to pregnancy may predispose to the development of hypertension, while we demonstrated a significative relationship between growth restriction and mean uterine pulsatility index. Further studies are needed to assess the value of hemodynamics evaluation in screening protocols of preeclampsia.

Automated summary

This study aimed to evaluate the relationship between maternal hemodynamics and pregnancy outcomes. It was found that both gestational hypertension/preeclampsia and fetal growth restriction were associated with increased uterine artery pulsatility index and significant differences in hemodynamic parameters. The uterine artery pulsatility index was found to be useful in predicting fetal growth restriction, while hemodynamic parameters were associated with the development of hypertensive disorders. Further research is needed to assess the value of hemodynamics evaluation in screening protocols of preeclampsia.