Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Both maternal and fetal heart rates were derived from the umbilical venous flow by means of spectral analysis of pulse-wave ultrasound images. To test whether the pulsatilities originate from the same heart or not, i.e., whether the fetal heart rate is a harmonic of the maternal heart rate, a correlation plot was fitted with a linear function. No correlation was found as the 95% confidence interval of the fit slope contained zero.
