Prediction of pre-eclampsia at 11-14 weeks of pregnancy using mean arterial pressure, uterine artery Doppler and pregnancy-associated plasma protein-A

Abstract

Background: The possibility of prediction of preeclampsia (PE) at 11-14 weeks of pregnancy is a fairly new concept and in recent years, studies combining various parameters at 11-14 weeks of pregnancy have been undertaken, but an algorithm with a high predictive value is yet to be developed. The objective of this study was to develop such a protocol using mean arterial pressure (MAP), uterine artery Doppler and PAPP-A (pregnancy associated plasma protein-A) at 11-14 weeks of pregnancy (individually or in combination) for prediction of preeclampsia in a developing country like India. Methods: A prospective cohort study was done at the Department of Obstetrics and Gynecology, King George Medical University, Lucknow, Uttar Pradesh with pregnant women attending the antenatal OPD at 11- 14 weeks of gestation. A preformed questionnaire was filled for the enrolled women, MAP, blood pressure was recorded, uterine artery Doppler was done, serum sample for PAPP-A was drawn. Uterine artery Doppler pulsatility index (PI) at 11-14 weeks of pregnancy was found to be a good screening method (sensitivity-75.9%, specificity-79.6% at cut-off of 1.7) for prediction of preeclampsia and IUGR. The data was analyzed using SPSS (Statistical Package for Social Sciences) Version 15.0 statistical analysis software. Results: Out of the 78 women enrolled, 29 women (37.18%) developed complications. Uterine artery Doppler pulsatility index (PI) at 11-14 weeks of pregnancy was found to be a good screening method (sensitivity-75.9%, specificity-79.6%) for prediction of preeclampsia and IUGR. Presence of early diastolic notch on uterine artery Doppler was found predictive for IUGR. MAP and PAPP-A were not found to have a significant correlation with development of these complications. Conclusions: This study concluded that uterine artery Doppler alone was a good screening method at 11-14 weeks of gestation for women at high risk of developing preeclampsia and related complications.