title: The relationship of regional frontal hypometabolism to executive function: a resting fluorodeoxyglucose PET study of patients with epilepsy and healthy controls.
abstract: Executive dysfunction is common in patients with frontal lobe damage and may depend on the location of pathology within the frontal lobes. However, it is unclear how specific brain regions contribute to different aspects of executive functioning. Eighteen patients with frontal lobe epilepsy, 10 patients with juvenile myoclonic epilepsy, and 14 controls completed a series of tests that measure a broad range of executive functions. Resting fluorodeoxyglucose positron emission tomography scans were collected and regional cerebral rates of glucose uptake values were regressed on test scores. Results revealed that frontal lobe metabolic values were strong predictors of executive functioning in patients with epilepsy, but not in healthy controls. However, nonfrontal regions also contributed unique variance on several measures, suggesting that (1) a network of frontal and nonfrontal regions subserve many executive functions and (2) resting hypometabolism can be a useful predictor of executive dysfunction in patients with epilepsy.
authors.affiliation: Multimodal Imaging Laboratory, University of California, San Diego, La Jolla, CA, USA. camcdonald@ucsd.edu
authors.forename: Carrie R
authors.initials: CR
authors.lastname: McDonald
authors.forename: Barbara E
authors.initials: BE
authors.lastname: Swartz
authors.forename: Eric
authors.initials: E
authors.lastname: Halgren
authors.forename: Ashok
authors.initials: A
authors.lastname: Patell
authors.forename: Richard
authors.initials: R
authors.lastname: Daimes
authors.forename: Mark
authors.initials: M
authors.lastname: Mandelkern
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001786:Blood Glucose / Q000378:metabolism*; D003071:Cognition / Q000502:physiology*; D017034:Epilepsy, Frontal Lobe / Q000000981:diagnostic imaging / Q000378:metabolism*; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D008297:Male; D020190:Myoclonic Epilepsy, Juvenile / Q000000981:diagnostic imaging / Q000378:metabolism*; D009483:Neuropsychological Tests; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D012044:Regression Analysis
chemical_list: D001786:Blood Glucose; D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18