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EEG Patterns in Persons Exposed to Ionizing Radiation as a Result of the Chernobyl Accident. Part 2: Quantitative EEG Analysis in Patients Who Had Acute Radiation Sickness

Received June 25, 2002; revised September 28, 2002; accepted October 15, 2002. From the Department of Radiation Psychoneurology, Institute of Clinical Radiology, Scientific Center for Radiation Medicine of Academy of Medical Sciences of Ukraine, 53 Melnikov Str., 04050, Kiev-50, Ukraine. Address correspondence to Dr. Loganovsky, 16D Heroes of Stalingrad Street, Apt. 173 Kiev, 04210, Ukraine; logan{at}rcrm.kiev.ua (E-Mail).

Cross-sectional quantitative electroencephalogram (qEEG) study (1996–2001) among Chernobyl accident survivors, who had confirmed acute radiation sickness and were irradiated in dose of 1–5 Gy, revealed the neurophysiological markers of ionizing radiation. Neuropsychological markers were: left fronto-temporal dominant frequency reduction; absolute -power lateralization to the left (dominant) hemisphere; relative -power increase in the fronto-temporal areas; absolute -power decrease in the left temporal region; absolute and relative -power diffusive decrease, which may reflect cortico-limbic dysfunction lateralized to the left, dominant hemisphere, with the fronto-temporal cortical and hippocampal damage. Quantitative electroencephalogram proposed for differentiation of radiation and nonradiation brain damages and as a new biological dosymetry method. High radiosensitivity of the brain, neocortex, and dominant hemisphere higher radiosensitivity are discussed.

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