[Acoustically evoked brain magnetic activity in normal and growth retarded fetuses during the third trimester of pregnancy].

The fetal magnetoencephalogram with a 31 chanal biomagnetometer made by Philips was measured in a fetal 1F-phase in 20 normotroph unimpaired and in 14 growth retarded fetuses with a birth weight < 5 percentile after completed 36th gestational week. Trough defined acoustic stimulations, which were applied over the maternal abdominal wall, it was possible to measure acoustic evoked cerebromagnetic field changes using a special computer programs. The registrated evoked cerebromagnetic field changes had a latence time of 112.8 +/- 18.4 ms in normotroph fetuses and 130.9 +/- 18.5 ms in hypotroph fetuses. The difference was significant (p < 0.01). The presented results lead to the conclusions that the fetal magnetoencephalography makes a differentiation between normal and disturbed fetal cerebral integrity possible.