Cognition in Secondary Progressive MS
This recent article published in MS Journal March 2012 looks into factors that contribute to cognitive changes in SPMS.
The study included 25 SPMS patients and 25 healthy matched controls. Using the symbol digit modalities test and PSAT to measure cognitive efficiency and logical memory tasks, they found that the cognitive reserve hypothesis is extended to the SPMS population. That higher lifetime intellectual reserves ( educational attainment, vocabulary knowledge, prior to MS leisure activities) are protective in progressive stages of MS.
Comments:
As studies have shown that the amount of lesion load does not correlate well with cognitive status in MS, this article helps look into factors that may contribute.
In the dementia literature, there has also been a lack of correlation with plaque load and cognition. There is a theory that cognitive reserve (amount of education and learning) helps to determine one's cognitive fate in RRMS as well as dementia. Studies have show that cognitive decline is more severe in SPMS than the other described types. Cognitive inefficiency and memory problems are the most common cognitive issues in SPMS. This study helps provide protective mechanisms that are possibly in one's control ( unlike baseline IQ) to help mitigate against cognitive decline in later stage MS.
Cognitive reserve in secondary
progressive multiple sclerosis.
James F Sumowski, Nancy Chiaravalloti,
Victoria M Leavitt and John DeLuca