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  • Title: Determinants of intelligence in childhood-onset epilepsy: a single-center study.
    Author: Park J, Yum MS, Choi HW, Kim EH, Kim HW, Ko TS.
    Journal: Epilepsy Behav; 2013 Oct; 29(1):166-71. PubMed ID: 23973641.
    Abstract:
    The purpose of this study was to quantify the intelligence of children with epilepsy and to determine the clinical factors associated with intellectual impairment. The medical records of patients diagnosed with childhood-onset epilepsy at a single tertiary medical center in Korea between 2006 and 2011 were retrospectively reviewed. The Korean Education Development Institute-Wechsler Intelligence Scale for Children or Korean Wechsler Intelligence Scale for adults was used to quantify the level of intelligence. Age at seizure onset, etiology, epilepsy duration, number of seizures in the last year, use of antiepileptic drugs, EEG/MRI findings, and epilepsy classification were recorded. The association between clinical factors and the intelligence was determined using logistic regression. Three hundred and twenty-two patients were included in the analysis. One hundred and seventy-six (54.7%) patients had low intelligence (intelligence quotient [IQ]<80) with 18 (5.6%) defined as borderline mental retardation (IQ 70-79), 47 (14.6%) as mild mental retardation (IQ 60-69), and 111 (34.5%) as moderate-to-severe mental retardation (IQ<60). Epilepsy duration, number of seizures in the last year, and epilepsy classification were significantly associated with low intelligence in multivariate logistic regression (p<0.05). However, when analyzed according to etiology, these factors were not associated with low intelligence in children with idiopathic epilepsy. The most important factors associated with low intelligence in childhood-onset epilepsy are the underlying etiology and, in cryptogenic and symptomatic epilepsy, seizure burden. The results of this study underscore the importance of seizure control to alleviate the harmful impact of epilepsy on cognition.
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