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Auditory evoked potential modifications according to clinical and biochemical responsiveness to fenfluramine
N Bruneau1, C Barthélémy, S Roux
1INSERM U316, CHU Bretonneau, Tours, France.
Insights
Fenfluramine treatment improved auditory evoked potentials in children with autistic behavior who responded clinically and biochemically. These changes suggest an amphetamine-like effect in responders with attention deficits and hyperactivity.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pharmacology
Background:
- Autistic behavior is a complex developmental disorder with challenges in attention and motor control.
- Fenfluramine, a medication, has been explored for its potential effects on neurotransmitter systems in autism.
- Auditory evoked potentials (AEPs) offer a measurable electrophysiological marker for neural processing.
Purpose of the Study:
- To investigate the impact of fenfluramine on auditory evoked potentials (AEPs) in children with autistic behavior.
- To correlate electrophysiological changes with clinical and biochemical responsiveness to fenfluramine.
- To explore the potential mechanism of fenfluramine's action in this population.
Main Methods:
- Studied AEPs in 13 children with autistic behavior receiving fenfluramine.
- Analyzed AEP amplitude and single-trial potential variability across different auditory stimulation intensities.
- Assessed clinical improvement and changes in dopaminergic metabolism.
Main Results:
- Clinically and biochemically responsive children (responders) showed increased AEP amplitude and decreased single-trial potential variability.
- These electrophysiological changes were observed at all tested sound intensities in responders.
- Non-responders exhibited no significant modifications in their AEPs.
- Responders demonstrated significant modifications in dopaminergic metabolism.
Conclusions:
- Fenfluramine's efficacy in autistic children is linked to specific clinical and biochemical responses.
- Electrophysiological changes in AEPs indicate improved auditory processing in responsive individuals.
- Results suggest fenfluramine may exert an amphetamine-like action, particularly benefiting autistic children with attention deficits and hyperactivity.
Abstract:
Evoked potentials to auditory stimulations varying in intensity were studied in 13 children with autistic behavior treated with fenfluramine. Modifications of both amplitude and single-trial potential variability were considered according to the clinical and biochemical responsiveness to this drug. Six children (responders) were clinically improved by the treatment. Electrophysiological data were affected according to the clinical and biochemical responsiveness to fenfluramine: the auditory evoked potential amplitude increased, and the single-trial potential variability decreased at each intensity level only in responders whose dopaminergic metabolism was significantly modified by fenfluramine treatment. No modification was found in nonresponders. Both biochemical and electrophysiological results argued for an amphetamine-like action of fenfluramine in those autistic children whose attention deficits are associated with motor disturbances including hyperactivity.