Umbilical artery doppler waveforms offer a robust and feasib
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Fetal heart rate short-term variation from computerized cardiotocography is a sensitive predictor of fetal hypoxemia; however, this technology is not available universally. This study demonstrates that fetal heart rate short-term variation can be derived from umbilical artery Doppler waveforms, obtained using standard clinical ultrasound equipment. The purpose of this study was to evaluate the feasibility of deriving Fetal heart rate short-term variation from UA Doppler waveforms obtained from a cohort of fetuses considered low risk for fetal hypoxia. The findings suggested that UA Doppler waveforms offer a robust and feasible method to derive short-term variation of the Fetal heart rate. It should be emphasized that the UA Doppler derived short term variation is not interchangeable with measurements derived with computerized cardiotocography. Accordingly, further investigations are needed to validate associations with the outcome, in order to determine the value of concurrent fetal cardiovascular and heart rate evaluations that are possible with the technique described here.

This was a prospective longitudinal study, conducted at two study sites, of 195 pregnancies considered low risk. Pulsed wave Doppler of the UAs was performed at 4 weekly intervals, between 14 and 40 weeks of gestation, using a standardized imaging protocol. Up to 12 consecutive UA Doppler waveforms were analyzed using offline processing software.

Baseline corrected Fetal heart rate short term variation increased significantly with gestational age and was correlated inversely with Fetal heart rate. The short term variation ranged from 3.5 ms at 14–20 weeks' gestation to 6.3 ms at 34–40 weeks' gestation. The change in heart rate short term variation did not differ between study sites or individual sonographers.

Source:https://obgyn.onlinelibrary.wiley.com/doi/10.1002/uog.23145
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