Attention deficit/hyperactivity disorder and medication with stimulants in young children: a DTI study

Area of Science:

• Neuroscience
• Pediatric Neurology
• Radiology

Background:

• The link between attention deficit/hyperactivity disorder (ADHD) and white matter connectivity, particularly in children under 10, remains unclear.
• The impact of psychostimulant treatment on brain structure in pediatric ADHD requires further investigation using advanced neuroimaging techniques.

Purpose of the Study:

• To investigate the effects of methylphenidate treatment on white matter integrity in children diagnosed with ADHD.
• To explore the relationship between white matter changes, ADHD symptoms, and treatment response using Diffusion Tensor Imaging (DTI).

Main Methods:

• Employed two complementary DTI analysis methods: Tract-Based Spatial Statistics (TBSS) and a robust tractography selection method.
• Compared white matter measures (Fractional Anisotropy and Mean Diffusivity) between medicated ADHD patients, drug-naïve ADHD patients, and healthy controls.

Main Results:

• No significant differences in Fractional Anisotropy (FA) were observed across the groups.
• Significantly reduced Mean Diffusivity (MD) was found in medicated ADHD patients compared to both healthy controls and drug-naïve ADHD patients.
• Correlations were identified between increased MD and performance indicators associated with ADHD symptoms.

Conclusions:

• Methylphenidate treatment in children with ADHD is associated with altered white matter microstructure, specifically reduced MD.
• These findings contribute to understanding white matter alterations in ADHD and the neurobiological effects of psychostimulant therapy.
• The study highlights the potential of DTI to elucidate treatment-related changes in pediatric ADHD.