title: Decreased blood flow of the left thalamus during somnolent episodes in a case of recurrent hypersomnia.
abstract: A 24-year-old male with recurrent hypersomnia associated with decreased blood flow in the thalamus on single photon emission computed tomography (SPECT) is reported. In the hypersomnolent period, the decrease of blood flow in the left thalamus was revealed in the SPECT and slow waves appeared sporadically or sometimes as a burst on the electroencephalogram (EEG). In a phase of insomnia in the convalescent period there were almost no slow waves in the resting EEG but many slow waves appeared on hyperventilation EEG and the power spectrum at this hyperventilation resembled the power spectrum at the resting EEG in the hypersomnolent period. In the remission period there was no abnormal data in these testings.
authors.affiliation: Department of Neuropsychiatry, Kurume University School of Medicine Kurume, Japan.
authors.forename: Iwao
authors.initials: I
authors.lastname: Nose
authors.forename: Toshihide
authors.initials: T
authors.lastname: Ookawa
authors.forename: Junji
authors.initials: J
authors.lastname: Tanaka
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Naohisa
authors.initials: N
authors.lastname: Uchimura
authors.forename: Hisao
authors.initials: H
authors.lastname: Maeda
authors.forename: Hiroo
authors.initials: H
authors.lastname: Kuwahara
mesh_terms: D000328:Adult; D006970:Disorders of Excessive Somnolence / Q000000981:diagnostic imaging*; D004569:Electroencephalography; D006801:Humans; D008297:Male; D012894:Sleep Stages / Q000502:physiology; D013788:Thalamus / Q000098:blood supply / Q000000981:diagnostic imaging*; D015899:Tomography, Emission-Computed, Single-Photon