[Oscillation spectrum of the fetal heart rate in diabetic mothers].

Antepartum monitoring of fetal heart rate throughout the last weeks of diabetic pregnancy revealed a significant restriction of the baseline irregularity towards the end of the antepartum period. The quantitative amount (in % of total recording time/week) of the patterns of reduced irregularity ('silent', 'narrowed undulatory') increased from the 34th to the 40th week of pregnancy whereas the amount of normal ('undulatory') irregularity became smaller. The results were discussed in regard of the disturbed fetoplacental unit in the diabetic pregnancy.