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Cross-correlation of fetal cardiac and somatic activity as an indicator of antenatal neural development
J A Dipietro1, R A Irizarry, M Hawkins
1Department of Population and Health Sciences, Johns Hopkins University, Baltimore, MD 21205, USA. jdipietr@jhsph.edu
Objective:
In this study, we wanted to model the emergence of coupling between fetal cardiac and somatic activity in normal and at-risk fetuses.
Study Design:
One hundred six fetuses of uncomplicated pregnancies were longitudinally monitored at 20, 24, 28, 32, 36, and 38 weeks of gestation by using a fetal actocardiograph and computerized data collection. Twenty-six fetuses of complicated pregnancies were also included. Statistical time series analysis techniques were used to examine the relation between fetal movement and fetal heart rate.
Results:
A linear increase was found in the magnitude of the cross-correlation function between fetal movement and fetal heart rate as gestation advanced, with coalescence around a peak lag of 5 seconds by 32 weeks. Fetuses that delivered before term evidenced accelerated fetal movement and fetal heart rate coupling, whereas fetuses affected by deleterious conditions showed a decline in developmental trajectory.
Conclusions:
The cross-correlation between fetal cardiac and somatic activity is an indicator of neuroregulation in human fetuses.