Differential patterns of memory performance in relapsing, remitting and secondary progressive multiple sclerosis

Area of Science:

• Neuroscience
• Clinical Neurology
• Cognitive Psychology

Background:

• Memory dysfunction is a prevalent symptom in multiple sclerosis (MS).
• While retrieval failure is often cited, acquisition deficits may also contribute to MS-related memory impairments.

Purpose of the Study:

• To investigate memory function in relapsing remitting (RR) and secondary progressive (SP) MS patients.
• To analyze performance patterns and determine if disease course impacts memory function.
• To compare MS patients' memory performance against healthy controls.

Main Methods:

• A case-control prospective study design was employed in a clinical setting.
• Fifty-five RR MS patients, 23 SP MS patients, and 80 healthy controls were assessed.
• A comprehensive neuropsychological battery, including the Signoret memory battery, attention, and executive function tasks, was utilized.

Main Results:

• MS patients demonstrated significantly poorer memory performance than controls across nearly all measures (P < 0.001).
• Significant differences were observed between MS subgroups in delayed recall, semantic cued recall, recognition, rate of forgetting, and intrusion errors.
• SP MS patients exhibited more pronounced memory deficits compared to RR MS patients.

Conclusions:

• Memory impairment is a consistent finding in multiple sclerosis.
• The disease course significantly influences the pattern and severity of memory dysfunction.
• Delayed recall is the most affected memory domain, differentiating between RR and SP MS patients, with SP patients showing moderate to severe impairment.