- •Raw fetal electrocardiogram data were recorded noninvasively at different gestations.
- •Fetal heart rate patterns were derived from the stored raw data.
- •Accelerations of the fetal heart rate were used as a proxy for fetal movements.
- •Duration of accelerations was significantly longer in women who used marijuana or methamphetamine.
- •Number of accelerations was significantly fewer in complicated pregnancies.
- •Duration of accelerations was significantly longer in women who concomitantly uses alcohol and tobacco, as early as 20–24 weeks’ gestation.
Abbreviations:BWZS (birthweight z-score), fECG (fetal electrocardiogram), FGR (fetal growth restriction), FHR (fetal heart rate), GA (gestational age), MCA (middle cerebral artery), mECG (maternal electrocardiogram), PI (pulsatility index), SPS (Safe Passage Study)
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