Clinical electrocardiography . W. 4 HIHMMH; itllHtBUl Hewlett, White, and Parkinson have observed sino-auricularheart-block during the administration of digitalis. Sicard andMeara have observed it from salicylic acid; Cushny, from aconitin; 102 CLINICAL ELECTROCARDIOGRAPHY Cohn, after morphin administration; and Neuhof, in various substances described as producing sino-auricularheart-block probably did so by augmenting vagus action. The failure of the auricle to contract may result from (1) failureor weakness of impulse production, (2) muscle weakness, and (3)blocking the impuls
Clinical electrocardiography . W. 4 HIHMMH; itllHtBUl Hewlett, White, and Parkinson have observed sino-auricularheart-block during the administration of digitalis. Sicard andMeara have observed it from salicylic acid; Cushny, from aconitin; 102 CLINICAL ELECTROCARDIOGRAPHY Cohn, after morphin administration; and Neuhof, in various substances described as producing sino-auricularheart-block probably did so by augmenting vagus action. The failure of the auricle to contract may result from (1) failureor weakness of impulse production, (2) muscle weakness, and (3)blocking the impulse between the sino-auricular node and theauricles. The electrocardiogram reveals standstill of the entireheart, the pause between complexes during the block being usuallysomewhat less than the interval between two normal cycles. Inextreme instances the pause may equal the time required for threeor even four normal cycles (Figs. 81-83). ABERRANT Q R S COMPLEXES IN ALL DERIVATIONS Much interest has been displayed the last few years
Size: 978px × 2556px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidclinicalelec, bookyear1922
