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Development of mechanisms regulating heart rates in human fetuses analyzed by factor analysis.

The histograms of fetal heart rates (FHR) in 57 fetuses between 19 and 42 weeks of gestation obtained for 3-hour periods were investigated, using factor analysis. I found at least 5 different and independent basal heart rates in these fetuses and the rates correlated well with the gestational age. Several isolated and underlying mechanisms regulating basal heart rates differentiate at definite periods during gestation and develop functionally with advancing fetal age. These findings are absent in anencephalic fetuses, yet fetuses with encephalocele show FHR changes similar to those seen in normal fetuses. The regulatory mechanisms of these five different basal heart rates are attributed to functions located at the level of the medulla or higher, in the near-term human fetus.