Prediction of Fetal Lung Maturity by Fetal Pulmonary Artery Doppler in Cases of Severe Pre-Eclampsia

Abstract

Background: Severe pre-eclampsia occurring remote from the term is a decision-making dilemma for the obstetrician, the general recommendation is that women with severe pre-eclampsia should be delivered to avoid maternal complications; others recommend prolonging pregnancy in most cases of severely premature pre-eclamptic gestation until the development of fetal lung maturity, development of fetal or maternal distress, or achievement of gestational age of 34 to 36-week of gestation. The cut-off level of pulmonary artery acceleration time to ejection time ratio [PAT/ET] that determines fetal lung maturity in cases of severe pre-eclampsia [PE] is not determined yet.Aim of the work: To study the Doppler indices of the main fetal pulmonary artery and their role in predicting respiratory distress syndrome [RDS] in severe pre-eclampsia.Patients and Methods: A prospective longitudinal cohort research was designed in which 102 pregnant women with PE were chosen and fetal pulmonary artery flow velocity data were acquired by Doppler ultrasound and linked with the development of neonatal RDS.Results: The AT/ET ratio in the fetal pulmonary artery velocity waveform was found to be directly related to the development of newborn RDS. A cut-off value of 0.3 resulted in a sensitivity of 71.4%, specificity of 79.7%, and total accuracy of 77.5%.Conclusion: A high AT/ET ratio in the fetal pulmonary artery is related to the future development of RDS in neonates of mothers with severe pre-eclampsia, implying that fetal pulmonary artery Doppler ultrasound may be a valuable tool in the identification of fetal lung maturity in situations of severe pre-eclampsia.

Keywords

• fetal lung maturity
• fetal pulmonary artery
• doppler
• severe pre-eclampsia