title: Correlation between interictal cerebral glucose hypometabolism and IQ in children with epilepsy.
abstract: The aim of this study was to understand the relationship between IQ and glucose metabolism in brain cells in a wide variety of subjects with epilepsy. The study participants were 78 children with epilepsy and 15 healthy children for comparison. All participants were administered the Chinese Wechsler Intelligence Scale for Children (C-WISC). The verbal intelligence quotient (VIQ), performance intelligence quotient (PIQ), and full-scale intelligence quotient (FIQ) were compared between children with epilepsy and typically developing children. Seventy-eight patients underwent interictal positron emission computed tomography (PET) using 2-deoxy-2[(18)F]fluoro-d-glucose (FDG) as the tracer for evaluating brain glucose metabolism. Verbal intelligence quotient, PIQ, and FIQ based on the C-WISC were significantly lower in children with epilepsy than those in the healthy comparison group (P<0.001, P=0.001, and P<0.001, respectively). The IQ of patients with normal metabolism, unifocal abnormal hypometabolism, and multifocal abnormal hypometabolism determined by PET differed significantly. The extent of the abnormal hypometabolism was negatively correlated with the FIQ (rs=-0.549, P<0.001). In patients with lateralized hypometabolism based on PET, the VIQ/PIQ discrepancy scores (|VIQ-PIQ|≥15 points) differed significantly between the left hemisphere abnormal hypometabolism and right hemisphere abnormal hypometabolism subgroups, with negative values in the left and positive values in the right subgroups (P=0.004). In conclusion, brain metabolic abnormalities are correlated with IQ, and performing interictal PET along with C-WISC can better assess the extent of severity of cognitive impairment and VIQ/PIQ discrepancy.
authors.affiliation: Department of Pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Neuroscience Institute, China; Southern Medical University, Guangdong Province, China.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Tang
authors.affiliation: Department of Pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Neuroscience Institute, China.
authors.forename: Zhihong
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Neuroscience Institute, China. Electronic address: zhaiqiongxiang@sina.com.
authors.forename: Qiongxiang
authors.initials: Q
authors.lastname: Zhai
authors.affiliation: Department of Pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Neuroscience Institute, China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Hao
authors.affiliation: Department of Pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Neuroscience Institute, China.
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Pediatrics, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Neuroscience Institute, China.
authors.forename: Xiaolu
authors.initials: X
authors.lastname: Zeng
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002540:Cerebral Cortex / Q000000981:diagnostic imaging / Q000378:metabolism*; D002648:Child; D003072:Cognition Disorders / Q000209:etiology*; D004827:Epilepsy / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D019788:Fluorodeoxyglucose F18; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D007360:Intelligence / Q000502:physiology*; D007361:Intelligence Tests; D008297:Male; D049268:Positron-Emission Tomography; D013223:Statistics as Topic
chemical_list: D019788:Fluorodeoxyglucose F18
keywords: (18)F-FDG PET; Children with epilepsy; IQ