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Microstructural abnormalities in the combined and inattentive subtypes of attention deficit hyperactivity disorder: a
Du Lei1, Jun Ma2, Xiaoxia Du3
11] Huaxi MR Research Center (HMRRC), Department of Radiology, West China Hospital of Sichuan University, Chengdu, Sichuan 610041, China [2] Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China.
Attention Deficit/Hyperactivity Disorder (ADHD) subtypes show distinct white matter abnormalities. Inattentive ADHD affects temporo-occipital areas, while combined ADHD impacts frontal-subcortical and fronto-limbic pathways.
Area of Science:
- Neuroscience
- Developmental Psychology
- Radiology
Background:
- Attention Deficit/Hyperactivity Disorder (ADHD) is associated with white matter abnormalities.
- Previous research findings are inconsistent, potentially due to not differentiating ADHD subtypes.
Purpose of the Study:
- To investigate distinct microstructural white matter abnormalities in combined (ADHD-C) and inattentive (ADHD-I) subtypes of ADHD.
- To identify unique and overlapping neuroanatomical differences between ADHD subtypes.
Main Methods:
- Diffusion Tensor Imaging (DTI) was used to analyze white matter microstructure.
- Key DTI metrics included Fractional Anisotropy (FA), radial diffusivity (RD), and axial diffusivity (AD).
- Study included 28 children with ADHD-C, 28 with ADHD-I, and 28 healthy controls.
Main Results:
- ADHD-I showed abnormalities in temporo-occipital regions.
- ADHD-C exhibited abnormalities in the frontal-subcortical circuit, fronto-limbic pathway, and temporo-occipital areas.
- Motor circuit abnormalities may differentiate ADHD-I from ADHD-C.
Conclusions:
- ADHD subtypes have unique white matter microstructural abnormalities.
- Findings highlight the importance of considering ADHD subtypes in neuroimaging research.
- Distinct patterns of brain abnormalities correlate with specific ADHD presentations.
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