Obsessive-compulsive symptoms in primary focal dystonia: a controlled study

Area of Science:

• Neurology
• Neuroscience
• Psychiatry

Background:

• Primary focal dystonia involves involuntary muscle contractions, likely linked to basal ganglia and cortical-basal pathways.
• Existing evidence on the association between primary dystonia and obsessive-compulsive symptoms (OCD) is limited and conflicting.

Purpose of the Study:

• To investigate the prevalence and severity of obsessive-compulsive symptoms in primary focal dystonia patients.
• To compare obsessive-compulsive symptoms in dystonia patients versus control groups with similar neurological conditions.
• To explore differences in psychopathology between botulinum toxin-treated and untreated dystonia patients.

Main Methods:

• Cross-sectional, descriptive, controlled study.
• Inclusion of 45 primary focal dystonia patients, 46 patients with other neurological disorders, and 30 healthy volunteers.
• Utilized psychiatric interviews, Symptom Checklist 90R, Yale-Brown Obsessive-Compulsive Scale/Checklist, and Unified Dystonia Rating Scale.

Main Results:

• Primary focal dystonia patients scored significantly higher on the Yale-Brown Obsessive-Compulsive Scale than both control groups.
• Obsessive-compulsive symptoms in dystonia patients were not found to be reactive to chronic disability.
• Major depression and generalized anxiety disorder were the most common psychiatric diagnoses; OCD frequency was 6.7%.

Conclusions:

• Primary focal dystonia is associated with elevated obsessive-compulsive symptoms, independent of disability.
• Shared neurobiological underpinnings, potentially involving cortical-basal dysfunction, may link dystonia and OCD.
• Active screening and treatment for psychopathology, particularly obsessive-compulsive symptoms, are recommended for primary focal dystonia patients.