The increase in our knowledge of muscular rheumatism has not been coincident with our increase in knowledge of the articular form. We are still quite in the dark as to the etiology of the disease, and we are still, no doubt, classifying under the head of muscular rheumatism a variety of different conditions. There are many facts in the history of the disease, or, at any rate, of some varieties, which suggest an infection, a view expressed by Leube a good many years ago. The occurrence at certain seasons, the not infrequent presence of prodromal symptoms, the fever which at times occurs, and the wandering involvement of many muscles, all speak for this interpretation. The occurrence of lesions in the internal organs, such as endocarditis, has not been emphasized, but there is reason to believe that these complications are not so very infrequent. Bechtold1 has recently studied the statistics
MUSCULAR RHEUMATISM AND ENDOCARDITIS. JAMA. 1906;XLVII(25):2097. doi:10.1001/jama.1906.02520250051009
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