Isolated Cognitive Decline in Neurologically Stable Patients with Multiple Sclerosis.

Area of Science:

• Neurology
• Neuroscience
• Immunology

Background:

• Cognitive deterioration is a key indicator of multiple sclerosis (MS) disease activity.
• Early identification of cognitive decline is vital for managing MS.
• Isolated cognitive decline (ICD) can occur without other clinical signs of progression.

Purpose of the Study:

• To investigate the occurrence and characteristics of cognitive decline and ICD in a large cohort of MS patients.
• To assess the relationship between cognitive changes and other markers of MS activity.

Main Methods:

• Analysis of radiological, neurological, and neuropsychological data from 1091 MS patients in the longitudinal GQ study.
• Definition of clinical disease activity (relapse or disability worsening) and MRI activity (new/enlarged T2 lesions).

Main Results:

• 6.4% of MS patients experienced cognitive decline; 4.0% had ICD without concurrent clinical activity.
• Most patients with cognitive decline also showed other neurological or radiological progression.
• No significant differences in disease severity were found between stable patients and those with cognitive worsening but normal baseline cognition.

Conclusions:

• Isolated cognitive decline (ICD) is infrequent in MS over short follow-up periods.
• Patients with severe MS are more susceptible to cognitive decline.
• Early detection of cognitive decline may be most beneficial for MS patients with normal cognition and mild disease.