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EEG Patterns in Persons Exposed to Ionizing Radiation as a Result of the Chernobyl Accident

Part 1: Conventional EEG Analysis

Received June 16, 2000; revised Sept. 23, 2000; accepted Oct. 19, 2000. From the Department of Neurology, Institute of Clinical Radiology, Research Centre for Radiation Medicine of Academy of Medical Sciences of Ukraine, WHO Collaborating Center, Kiev, Ukraine. Address correspondence to Dr. Loganovsky, 16D Heroes of Stalingrad Street, Apt. 173, Kiev, 04210, Ukraine. E-mail: kosti{at}morion.kiev.ua

Prospective conventional EEG study was carried out 3–5 and 10–13 years after the Chernobyl accident (1986) in patients who had acute radiation sickness and in emergency workers in 1986 ("liquidators"). Control groups comprised healthy volunteers; veterans of the Afghanistan war with posttraumatic stress disorder; veterans with mild traumatic brain injury; and patients with dyscirculatory encephalopathy. In 3–5 years after irradiation, there were irritated EEG changes with paroxysmal activity shifted to the left frontotemporal region (cortical-limbic overactivation) that were transformed 10–13 years after irradiation toward a low-voltage EEG pattern with excess of fast (beta) and slow (delta) activity together with depression of alpha and theta activity (organic brain damage with inhibition of the cortical-limbic system). Quantitative EEG is likely to be very informative for investigation of dose–effect relationships.

Key Words: Radiation • Chernobyl Accident • EEG

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