Biomagnetic measurements of the brain activity of preeclamptic pregnant women using a superconducting quantum interference device.

Abstract Biomagnetic brain activity was studied in 17 full-term pregnant women with symptoms of pre-eclampsia using the biomagnetometer SQUID. The results show obvious differences both in the waveforms and in the spectra that obtained from statistical Fourier analysis by comparing them with the corresponding results from 87 pregnant women with normal full-term pregnancies. Specifically, in the pathological pregnancies the high magnetic field activity emitted from points of the mother's brain is distributed in the 2–7 Hz band frequency range whereas in normal pregnancies we found low magnetic field activity distributed over the 7 Hz band frequency.