system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Age Factors, Blood-Brain Barrier, Brain Edema, Brain Mapping, Child Development, Child, Preschool, Diffusion Magnetic Resonance Imaging, Female, Follow-Up Studies, Functional Laterality, Hippocampus, Humans, Infant, Male, Seizures, Febrile.
user
Are prolonged febrile seizures associated with hippocampal vasogenic edema and developmental changes? Context: There is mounting evidence that a prolonged febrile seizure (PFS) can cause acute hippocampal edema although the nature of that edema remains uncertain. The principal aims of the current study were: (1) to use apparent diffusion coefficient (ADC) measurements to further characterize the hippocampal edema previously identified within 5 days of a PFS, and (2) to determine whether the age dependency of ADC in the hippocampus is different in patients when compared to a control population following a PFS. Diffusion weighted imaging was acquired in 23 children within 5 days of a PFS, and in 14 of these children a mean of 5.5 months later. Twenty-four control children were enrolled. There was a reduction in ADC between the acute and follow-up investigations [mean reduction = 0.0072 mm2/s/month since PFS (95% confidence interval; 0.0001-0.014 mm2/s/month since PFS), p = 0.048] consistent with early vasogenic edema, followed by recovery in children investigated within 2 days of a PFS. In addition, the behavior of ADC with respect to age was different in patients when compared to control subjects [mean difference in slope =-0.155 mm2/s/log10 age (95% confidence interval; -0.290-0.0203 mm2/s/log10 age), p = 0.029], in that the expected age dependence was observed only in the control subjects.
assistant
We suggest that these latter findings are most consistent with a preexisting developmental hippocampal abnormality that may predispose individuals to having a PFS. Final Decision: yes