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Lack of Vitamin D Related to MS Brain Atrophy
Low vitamin D levels may be associated with more advanced physical disability and cognitive impairment in persons with multiple sclerosis (MS), studies have shown.
The results indicated that the majority of MS patients and healthy controls had insufficient vitamin D levels. Clinical evaluation and magnetic resonance imaging (MRI) images show low blood levels of total vitamin D and certain active vitamin D byproducts are associated with increased disability, brain atrophy and brain lesion load in MS patients. And a potential association exists between cognitive impairment in MS patients and low vitamin D levels.
The MRI study involved 236 MS patients – 208 diagnosed with the relapsing-remitting type and 28 with secondary progressive, a more destructive form of MS – and 22 persons without MS.
All participants provided blood serum samples, which were analyzed for total vitamin D levels as well as levels of active vitamin D byproducts. MRI scans performed within three months of blood sampling were available for 163 of the MS patients.
Results showed that only seven percent of persons with secondary-progressive MS showed sufficient vitamin D, compared to 18.3 percent of patients with the less severe relapsing-remitting type.
Higher levels of vitamin D3 and vitamin D3 metabolism byproducts (analyzed as a ratio) also were associated with better scores on disability tests, results showed, and with less brain atrophy and fewer lesions on MRI scans.
Commenting on these results, Bianca Weinstock-Guttman, first author on the study said: "Clinical studies are necessary to assess vitamin D supplementation and the underlying mechanism that contributes to MS disease progression."
While lower-than-normal vitamin D status is known to be associated with a higher risk of developing MS, little is known about its relationship to cognitive impairment.
Sarah A. Morrow, lead author on the cognitive-impairment study, compared vitamin D levels in blood samples of 136 MS patients with the results of their neuropsychological assessments that tested multiple types of cognition affected by MS.
"Results showed that MS patients who were impaired on tests of executive function – critical reasoning and abstract thinking – and the ability to plan and organise, were more likely to be deficient in vitamin D," said Morrow.
Morrow noted there also was a suggestion that verbal fluency (word generation) and visual-spatial memory (learning and memory of shapes and figures) is more likely to be affected when vitamin D levels are not sufficient.
REHACARE.de; Source: University at Buffalo
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( Source: REHACARE.de )