Abstract
There has been an extensive literature on accidents occurring during cardiazol treatment, and since the largely conflicting pathogenic view-points have been discussed in recent reviews (Gross and Gross-May, 1939; Kennedy, 1940; Wyllie, 1940), there is no need for their detailed enumeration. Gross and Gross-May, whose paper was unfortunately not available to us in the original, recently summed up the more important causes of accidents, grouping them into mechanical disorders, particularly of the osseous, tendinous and muscular system; disturbances of the vascular system—arrhythmia, auricular fibrillation, syncope and vascular spasm due to the specific action of cardiazol; and finally, respiratory disturbances—arrest of respiration, pulmonary embolism, and abscess due to thrombophlebitis at the site of injection.

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