Developmental milestones of the autonomic nervous system revealed via longitudinal monitoring of fetal heart rate variability.
BACKGROUND:Fetal heart rate variability (fHRV) of normal-to-normal (NN) beat intervals provides high-temporal resolution access to assess the functioning of the autonomic nervous system (ANS).AIM:To determine critical periods of fetal autonomic maturation.The developmental pace is hypothesized to change with gestational age (GA).STUDY DESIGN:Prospe