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Visualizing Neuropharmacological Effects of Guanfacine Extended Release in Attention Deficit Hyperactivity Disorder
Takahiro Ikeda1, Akari Inoue2, Daisuke Tanaka1
1Department of Pediatrics, Jichi Medical University, Shimotsuke, Japan.
Frontiers in Neuroergonomics
|January 18, 2024
Summary
Guanfacine extended release (GXR) did not significantly alter right prefrontal cortex activity in children with ADHD. However, post-hoc analysis revealed activation in the right angular gyrus, suggesting a potential biomarker for GXR
Area of Science:
- Neuroscience
- Pediatric Psychiatry
- Pharmacology
Background:
- Attention deficit hyperactivity disorder (ADHD) is characterized by deficits in inhibitory control.
- Previous research indicated that medications like OROS-MPH and ATX modulate right prefrontal cortex (PFC) function in ADHD.
- The neural mechanisms underlying the effects of guanfacine extended release (GXR) on inhibitory control in ADHD remain underexplored.
Purpose of the Study:
- To investigate the acute neural effects of GXR on inhibitory control in school-aged children with ADHD.
- To compare the neurobiological impact of GXR with placebo using functional near-infrared spectroscopy (fNIRS).
- To explore potential differences in neural substrates compared to other ADHD medications.
Main Methods:
- A randomized, double-blind, placebo-controlled, crossover study involving 12 children with ADHD (6-10 years old).
- Participants performed a go/no-go task before and 3 hours after administration of GXR or placebo, following a washout period.
- fNIRS monitored right PFC hemodynamics; exploratory analysis examined other brain regions.
Main Results:
- Primary analysis showed no significant main effects or interactions for medication type and age on right PFC activity.
- Post-hoc analysis revealed a significant increase in oxy-hemoglobin (oxy-Hb) signal in the right angular gyrus (AG) after GXR administration (p < 0.05).
- The observed activation in the right AG differed from the effects of OROS-MPH and ATX on right PFC function.
Conclusions:
- GXR's acute effects on inhibitory control in ADHD children do not appear to involve modulation of the right PFC, unlike OROS-MPH and ATX.
- The study suggests that activation in the right angular gyrus may be associated with improved cognitive performance with GXR.
- The right AG activation could potentially serve as a biological marker for monitoring GXR's therapeutic effects in ADHD.
Keywords:
angular gyrusattention deficit hyperactivity disordercortical hemodynamicsdevelopmental disorderdorsolateral prefrontal cortexoptical topography
