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Cerebral glucose utilization during sleep in Landau-Kleffner syndrome: a PET study
Insights
Landau-Kleffner syndrome disrupts normal brain glucose metabolism during sleep, particularly in the temporal lobes. These metabolic changes, observed via FDG-PET, varied among children but indicate abnormal brain activity in this epilepsy syndrome.
Area of Science:
- Neuroscience
- Pediatric Neurology
- Epileptology
Background:
- Landau-Kleffner syndrome (LKS) is a rare childhood disorder characterized by acquired aphasia and epilepsy.
- Understanding the neurophysiological underpinnings of LKS, especially during sleep, is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate cerebral glucose utilization patterns in children with LKS during sleep.
- To correlate electroencephalographic (EEG) findings with metabolic activity in LKS patients.
Main Methods:
- Positron-emission tomography (PET) using [18F]fluorodeoxyglucose (FDG) was employed to measure glucose metabolism.
- EEG monitoring during drug-induced sleep was performed in three male children diagnosed with LKS.
- Metabolic data was analyzed in relation to EEG discharge patterns and temporal lobe activity.
Main Results:
- Cerebral glucose utilization was abnormal in all three LKS patients during sleep.
- Metabolic disturbances predominantly affected the temporal lobes, with varying laterality (right, left, or bilateral).
- Specific patterns included increased metabolism in one case and decreased metabolism in others, correlating with EEG findings and CNS maturation.
Conclusions:
- Sleep-associated cerebral glucose hypometabolism, particularly in temporal regions, is a characteristic feature of Landau-Kleffner syndrome.
- Metabolic patterns in LKS can be asymmetric and may relate to central nervous system maturation processes.
- FDG-PET during sleep provides valuable insights into the pathophysiology of LKS.
Abstract:
Three right-handed male children (aged 5, 6, and 11 years) with signs, symptoms and/or history of the syndrome of acquired aphasia-epilepsy (Landau-Kleffner syndrome) were studied during drug-induced, electroencephalographically (EEG)-monitored sleep by positron-emission tomography (PET) and the [18F]fluorodeoxyglucose (FDG) method. Our data demonstrate that in Landau-Kleffner syndrome, cerebral glucose utilization is not normal during sleep. The metabolic pattern varied between the children but the metabolic disturbances always predominated over the temporal lobes. They were right-sided, left-sided, or bilateral. In the two first patients, EEG recordings showed continuous spike-and-wave discharges during sleep and a right-greater-than-left asymmetry was observed in temporal areas. In patient 1, the asymmetry was associated with a relative increase of glucose utilization of the right posterior temporal region. In patient 2, the glucose utilization was relatively decreased in the left anterotemporal and left perisylvian regions. In patient 3, the sleep EEG showed no discharge and no significant asymmetry was observed; however, glucose utilization of both temporal lobes was decreased. Lower metabolic rates in subcortical structures than in cortex were also noted in the three children. This metabolic pattern may be related to the maturation of the central nervous system (CNS).