White matter abnormalities in methcathinone abusers with an extrapyramidal syndrome

Area of Science:

• Neuroimaging
• Neurology
• Toxicology

Background:

• Intravenous methcathinone (ephedrone) abuse is linked to a distinctive extrapyramidal syndrome.
• White matter integrity is crucial for motor function and executive control.

Purpose of the Study:

• To investigate white matter abnormalities in patients with methcathinone-induced extrapyramidal syndrome.
• To assess the relationship between white matter integrity and clinical outcomes.

Main Methods:

• Diffusion tensor imaging (DTI) was used to evaluate whole-brain white matter structure in 10 patients and 15 controls.
• Probabilistic tractography was employed to map connections between cortical regions and the globus pallidus.

Main Results:

• Patients exhibited diffuse significant decreases in white matter fractional anisotropy (FA) compared to controls.
• Severe white matter abnormalities were identified underlying the right ventral premotor and medial frontal cortices.
• Reduced FA was observed in tracts connecting cortical regions to the globus pallidus.
• A correlation between lower FA in the left corticospinal tract and greater functional deficit was found, though this region did not show overall reduced FA.

Conclusions:

• Methcathinone abuse leads to widespread white matter damage, with pronounced effects on executive motor control regions.
• The findings highlight the neurotoxic effects of methcathinone on white matter microstructure.