Psychiatric Comorbidity During the Prodromal Period in Patients With Multiple Sclerosis

Area of Science:

• Neurology
• Psychiatry
• Epidemiology

Background:

• Psychiatric morbidity is a known complication following a multiple sclerosis (MS) diagnosis.
• However, the prevalence and impact of psychiatric conditions during the prodromal phase (before MS onset) remain largely uncharacterized.

Purpose of the Study:

• To compare the prevalence and relative burden of psychiatric morbidity in individuals who later develop MS versus matched controls before MS onset.
• To investigate healthcare utilization patterns for psychiatric conditions in the pre-MS period.

Main Methods:

• Utilized linked administrative and clinical data from British Columbia, Canada.
• Identified MS cases and matched them with general population controls.
• Assessed psychiatric morbidity and healthcare utilization in the 5 years preceding MS onset using validated definitions and statistical models.

Main Results:

• Individuals who developed MS showed a significantly higher prevalence of psychiatric morbidity in the 5 years before diagnosis compared to controls (14.9% vs. 28.0% in the administrative cohort).
• Pre-MS onset, MS cases exhibited increased physician visits, psychiatrist consultations, hospitalizations, and psychotropic medication prescriptions compared to controls.
• These differences were particularly pronounced in the year immediately preceding MS onset.

Conclusions:

• Psychiatric morbidity represents a substantial burden in the prodromal phase of multiple sclerosis.
• Elevated psychiatric morbidity and associated healthcare utilization may serve as potential early indicators or features of the MS prodrome.