In a group of 31 women with myasthenia the urinary excretion of 17-ketosteroids and their fractions (11-deoxy-17-ketosteroids, dehydroisoandrosterone) and 17-hydroxycorticosterone were determined. A statistically significant decrease was observed in the excretion of these substances. Besides that, the plasma cortisol level was determined in these patients and the results obtained in the whole group were at the lower normal range of the laboratory and in 40% of cases they were significantly lower (p less than 0.01). The obtained results may suggest that adrenocortical hypofunction exists in many cases of myasthenia. The pertinent literature is reviewed.
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