With the mobilization of our troops, and especially the drafted troops, at the entrance of this country into the war, the problem of sorting the fit from the unfit was one of the first to come up. In attempting to solve this many other problems for the medical corps arose. Among these, one of the most interesting and at the same time one of the most baffling, was the problem of determining the etiologic factors of the symptom complex observed by DaCosta during the Civil war and described by him as the "irritable heart of soldiers." In the present war this condition has been termed by Lewis the "effort syndrome." As this problem has been studied more carefully, it has proved to be a many sided one, and it now seems quite certain that the symptom complex represents several clinical entities. Many opinions have been advanced as to the etiologic
WEARN JT, STURGIS CC. STUDIES ON EPINEPHRIN. I: EFFECTS OF THE INJECTION OF EPINEPHRIN IN SOLDIERS WITH "IRRITABLE HEART". Arch Intern Med (Chic). 1919;24(3):247–268. doi:10.1001/archinte.1919.00090260002001
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