[Prevalence of antimicrosomal antibodies in patients with multiple sclerosis]

The aim of this study was to assess the prevalence of Antimicrosomal Antibodies AMA, thyroid function and the occurrence of hypothyroidism symptoms in patients with Multiple Sclerosis (MS). Clinical examination was carried out in 21 MS patients; thyroid-stimulating hormone (TSH), thyroxine (T4), free T4 and AMA were measured. Mean age was 41.05 years. Hypothyroidism symptoms included fatigue, weakness, lethargy and paresthesia. AMA were found in four patients (19%). Three categories of disease duration were considered: <60 months (3 patients AMA+; 7 AMA-), 60-120 months (8 patients AMA-), and >120 months (1 patient AMA+; 2 AMA-). Two patients presented decreased free T4 levels, but there was no associated decrease in T4 and TSH levels. In two patients, a mild increase in TSH levels was observed: one presented normal T4 levels (subclinical hypothyroidism) and the other one had low free T4 levels (classical hypothyroidism). We conclude that AMA measurement and thyroid function tests should become part of the routine assessment of MS patients, in view of the inaccuracy currently observed in the assessment of clinical hypothyroidism as a result of the superposition of hypothyroidism and MS signs and symptoms.