EEG changes in the early postoperative period after excision of tumors of basal-diencephalic location

• Published in: Human physiology 2008-01, Vol.34 (1), p.32-38
• Main Authors: Grindel, OM, Voronina, IA, Voronov, V G, Skoryatina, I G, Shkarubo, AN
• Format: Article
• Language: English
• ISSN: 0362-1197; 1608-3164
• DOI: 10.1007/s10747-008-1004-z

Changes in the EEG spectral coherence characteristics were analyzed in 60 patients in the early postoperative period after the excision of basal-diencephalic tumors (located in the hypothalamic and thalamic structures) using different surgical approaches (transcallosal, subfrontal, and transnasal). On the first day after surgery, all the patients exhibited a significant decrease in the Delta , [thetas], and alpha rhythms compared to the preoperative recordings. Decreased interhemispheric and increased intrahemispheric coherent relations were found simultaneously with changes in the EEG power in patients operated on through the transcranial approach. Within 7-10 days, the pathological structure of the functional relations changed reciprocally. In the case of the transnasal approach, the patients exhibited only an impairment of interhemispheric interaction in the frontocentral areas on the first day after surgery. A decrease in the interhemispheric and an increase in the intrahemispheric coherent relations were determined by the irritation of the pathologically changed hypothalamic and thalamic structures, rather than the dissection of the corpus callosum.