title: Workers on transformation of the shelter object of the Chernobyl nuclear power plant into an ecologically-safe system show qEEG abnormalities and cognitive dysfunctions: A follow-up study.
abstract: The present study aimed at assessing bioelectric activity and cognitive functions in the workers on the conversion project of the "Shelter" object (SO) of the Chernobyl nuclear power plant into an environmentally safe system.
  
  
  
  A total of 196 men were included and examined before (t0) and after (t1) working on the SO in the period 2004-2008. They underwent a qEEG and a battery of neuropsychological and psychiatric assessments.
  
  
  
  At t1, the organized type of qEEG shifted towards the disorganized one. An increase of spectral δ-power in the left frontotemporal area, of θ- and α-power in the left temporal area, with redistribution of α-activity to the front and reduction of dominant frequency in the left temporal area, were registered. Further, neurocognitive tests revealed the presence of mild cognitive disorders at t1. Interestingly, those subjects previously exposed to radiation with no consequences, were more resistant to these detrimental effects.
  
  
  
  Taken together, the disturbances observed may be considered as cognitive symptoms of a chronic fatigue syndrome resulting from the exposure to ionizing radiation. Simple and non-invasive assessments, such as those performed by us, may be helpful to detect early brain changes caused by the presence of radiological risk factors.
authors.affiliation: a State Institution "National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine" , Kyiv , Ukraine.
authors.forename: Konstantyn
authors.initials: K
authors.lastname: Loganovsky
authors.affiliation: a State Institution "National Research Center for Radiation Medicine of the National Academy of Medical Sciences of Ukraine" , Kyiv , Ukraine.
authors.forename: Iryna
authors.initials: I
authors.lastname: Perchuk
authors.affiliation: b Dipartimento di Medicina Clinica e Sperimentale, Section of Psychiatry, University of Pisa , Pisa , Italy.
authors.forename: Donatella
authors.initials: D
authors.lastname: Marazziti
mesh_terms: D000328:Adult; D001921:Brain / Q000503:physiopathology*; D047852:Chernobyl Nuclear Accident; D060825:Cognitive Dysfunction / Q000503:physiopathology*; D004569:Electroencephalography; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests; D055848:Nuclear Power Plants; D016273:Occupational Exposure / Q000009:adverse effects*; D011446:Prospective Studies; D011832:Radiation Injuries / Q000150:complications*; D011839:Radiation, Ionizing; D012044:Regression Analysis; D014455:Ukraine; D055815:Young Adult
keywords: Chernobyl nuclear power plant; brain damage; ionizing radiation; neuropsychological tests; work stress