With the development of an appropriate electrode, recording of the fetal electroencephalogram (FEEG) during labor has become a useful research technique. Four patients developed seizure activity in infancy. The FEEGs of these infants resemble the tracings obtained later in life. Abnormalities included persistent sharp-wave activity and prolonged voltage depression. In addition to the authors' knowledge, we have the first reported example of an FEEG with the appearance of periodic trace from a fetus who later developed hypsarrhythmia. The FEEG establishes abnormal electrical activity reflecting brain damage incurred prior to birth.
Sokol RJ, Rosen MG, Borgstedt AD, Lawrence RA. Abnormal Electrical Activity of the Fetal Brain and Seizures of the Infant. Am J Dis Child. 1974;127(4):477-483. doi:10.1001/archpedi.1974.02110230023003