title: Modafinil-induced hippocampal activation in narcolepsy.
abstract: This study was undertaken to investigate regional metabolic abnormalities and to determine the effects of modafinil in narcoleptics on cerebral glucose metabolism using [(18)F] fluorodeoxyglucose positron emission tomography (FDG PET). Eight narcoleptic patients participated in the study. Two [(18)F] FDG PET scans were obtained before and after 2 weeks of modafinil treatment. To identify the effect of modafinil on regional cerebral abnormalities in narcoleptics, pre- and post-treatment PET scans were compared using paired t-statistics with voxel-wised manner. In narcolepsy patients, significant decreases in cerebral glucose metabolism were observed in the midbrain and upper pons, bilateral hypothalamus, posterior thalamus, hippocampus and right parahippocampus as compared with healthy subjects. After treatment, a significant increase in glucose metabolism in the left hippocampus was found in comparison with pre-treatment scan. This study demonstrated that modafinil activates the hippocampus which receives the afferents from hypothalamus, the center of sleep-wake rhythm.
authors.affiliation: Department of Nuclear Medicine, Seoul National University Bundang Hospital, Gyeonggi-do, Korea.
authors.forename: Yu Kyeong
authors.initials: YK
authors.lastname: Kim
authors.forename: In-Young
authors.initials: IY
authors.lastname: Yoon
authors.forename: Yoon-Kyung
authors.initials: YK
authors.lastname: Shin
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Cho
authors.forename: Sang Eun
authors.initials: SE
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D001559:Benzhydryl Compounds / Q000494:pharmacology* / Q000627:therapeutic use; D001931:Brain Mapping; D001933:Brain Stem / Q000000981:diagnostic imaging / Q000187:drug effects / Q000378:metabolism; D000697:Central Nervous System Stimulants / Q000494:pharmacology* / Q000627:therapeutic use; D004734:Energy Metabolism / Q000187:drug effects; D005260:Female; D019788:Fluorodeoxyglucose F18; D007839:Functional Laterality / Q000187:drug effects; D005947:Glucose / Q000378:metabolism; D006624:Hippocampus / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000378:metabolism*; D006801:Humans; D007031:Hypothalamus / Q000000981:diagnostic imaging / Q000187:drug effects / Q000378:metabolism; D008297:Male; D000077408:Modafinil; D009290:Narcolepsy / Q000000981:diagnostic imaging / Q000188:drug therapy* / Q000503:physiopathology*; D009434:Neural Pathways / Q000000981:diagnostic imaging / Q000187:drug effects / Q000378:metabolism; D049268:Positron-Emission Tomography; D012890:Sleep; D013788:Thalamus / Q000000981:diagnostic imaging / Q000187:drug effects / Q000378:metabolism; D016896:Treatment Outcome; D014851:Wakefulness
chemical_list: D001559:Benzhydryl Compounds; D000697:Central Nervous System Stimulants; D019788:Fluorodeoxyglucose F18; D005947:Glucose; D000077408:Modafinil