[Dynamics of the fetal EEG spectral pattern in normal delivery (author's transl)].

While correlations of cerebral development and EEG of the newborn are well known, there are only a few investigations concerning the fetal EEG (FEEG). This depends mainly on the higher rate of artefacts under the conditions of delivery when bioelectrical phenomenas of low voltage are registered. Under these aspects special recording techniques such as special electrodes, filters and computerized analysis are necessary (G. Haase & Sohn, Feinwerktechnik, 2000 Wedel/Holstein (Impedanz: 3-5 kOhm). The FEEG was recorded continuously under the demands of a delivery room at 18 normal deliveries and regular developed children with inconspicious cardiotocogram (CTG) and normal acid-base-status (ABS). In some cases we continued the FEEG-documentation after birth into the first hours of the perinatal period. A precise documentation of the biological as well as mechanical artefacts was realized. The cerebral electrical phenomenas consisted of two major categories: a) cerebral autorhythmic events (EEG of the newborn) and b) environmental factors. These alterations account to labour and fetal heart rate (FHR). In contrast to recent publications of other workers in this field, emphasis was laid on longterm analysis of cerebroelectric variations. The present data describe the dynamics of the FEEG-alterations under the demand of a normal delivery. The spectral analysis of FEEG-pattern under fetal distress needs further investigation.