There has not been a major contribution to the knowledge of heart disease during 1934. Minor advances have been made, however, and some recent gains consolidated. We cannot here review adequately all that has been done; it must suffice merely to indicate certain trends and to cite some of the more interesting publications. While a few of the reports seem more wonderful than probable, we have usually avoided an especially critical attitude because the newness of the work prevents mature conclusion. When convenient for the purpose of continuity or completeness, reference is made to reports published previous to 1934.
PHYSIOLOGY AND EXPERIMENTAL PATHOLOGY AND PHARMACOLOGY
Cannon1 outlines the development of the knowledge concerning the chemical mediators of nervous impulses. It may be taken as an established fact that the vagus nerve exerts its inhibitive action on the heart by liberating a substance indistinguishable from acetylcholine and that the sympathetic
GRAYBIEL A, WHITE PD. Progress in Internal Medicine: DISEASES OF THE HEART A REVIEW OF CONTRIBUTIONS MADE DURING 1934. Arch Intern Med (Chic). 1935;55(5):842–870. doi:https://doi.org/10.1001/archinte.1935.00160230135011
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