Predicting poor neonatal outcome: a comparative study of noninvasive antenatal testing methods

Area of Science:

• Perinatal medicine
• Fetal monitoring
• Neonatal outcomes

Background:

• Fetal well-being assessment in late pregnancy involves multiple indicators.
• Direct comparisons of these indicators for predicting adverse outcomes in small for gestational age (SGA) fetuses are limited.

Purpose of the Study:

• To compare the effectiveness of amniotic fluid indexes, umbilical cord arterial Doppler waveforms, nonstress tests, and biophysical profiles.
• To determine the best predictor of poor neonatal outcomes in SGA fetuses.

Main Methods:

• A cohort of 108 SGA fetuses was studied, with follow-up in 97 cases.
• Receiver operating characteristic curves and logistic regression were used for analysis.
• Umbilical cord arterial Doppler imaging, amniotic fluid index, nonstress test, and biophysical profile were compared.

Main Results:

• Umbilical cord Doppler imaging demonstrated the highest sensitivity (64%) in predicting poor outcomes.
• Low amniotic fluid volume (oligohydramnios) had 32% sensitivity, biophysical profile 18%, and nonstress test 14%.
• Doppler systolic:diastolic ratio ≥ 4.0 and amniotic fluid index ≤ 5 cm were accurate predictors; Doppler and amniotic fluid index were independent predictors.

Conclusions:

• Umbilical cord arterial Doppler waveform abnormalities are the most accurate predictor of adverse neonatal outcomes in SGA fetuses.
• Routine inclusion of umbilical cord arterial Doppler analysis is recommended for SGA fetus surveillance.