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Multiple Sclerosis

"High prevalence of vitamin D deficiency and reduced bone mass in multiple sclerosis"

Nieves J; Cosman F; Herbert J; Shen V; Lindsay R, Neurology 1994 Sep;44(9):1687-92

ABSTRACT: BACKGROUND: Female patients with multiple sclerosis (MS) are at risk for osteoporosis because of gender, immobility, and corticosteroid use. METHODS: Bone mineral density (BMD) was measured by dual x-ray absorptiometry in 80 female MS patients admitted to a tertiary care hospital. All patients completed a questionnaire that included measurements of dietary intake and sunlight exposure. Biochemical indices of bone metabolism and turnover were measured in a random sample of 52 patients. RESULTS: BMD of the lumbar spine and femoral neck was 1 to 2 SDs lower in MS women compared with a healthy reference population. BMD was lower in patients with more severe MS. The mean 25(OH)D level of the sample population (43 nmol/l) was in the insufficient range, and 12 patients (23%) had frank vitamin D deficiency (< 25 nmol/l). BMD and age-related BMD (z scores) at all skeletal sites measured were lowest when 25(OH)D levels were deficient. Parathyroid hormone (PTH) was frankly elevated in 13% of patients. PTH levels were negatively correlated with 25(OH)D levels and with BMD. Dietary intake of vitamin D was below the recommended level in 80% of patients, and 40% reported no weekly sunlight exposure. After controlling for age, cumulative steroid use was not a determinant of BMD. CONCLUSIONS: BMD was significantly reduced in female MS patients, which might increase fracture risk two- to threefold. Vitamin D deficiency with secondary hyperparathyroidism is prevalent and is probably a significant cause of low BMD in this population. Vitamin D deficiency in the female MS patient might be safely and inexpensively corrected by the routine use of vitamin D supplements.

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