Clinical electrocardiography / by Sir Thomas Lewis.

  • Thomas Lewis
Date:
1913
Catalogue details

Licence: Public Domain Mark

Credit: Clinical electrocardiography / by Sir Thomas Lewis. Source: Wellcome Collection.

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    Fig. 11. Electrocardiograms from the several chief classes of lower vertebrata. With the exception of the curves from birds, the remaining electrocardio¬ grams have much in common ; the ventricular contraction in the bird seems to originate near the apex. A. Electrocardiogram from a frog, leading from the middle line, directly above and below the heart. B. Electrocardiogram from a gold fish ; leading from the centre of the left branchial cleft to a point caudal to the apex of the heart. C. Electrocardiogram from a pigeon ; leading from the cephalic and caudal ends of the sternum in the middle line. D. Electrocardiogram from a tortoise ; leading from the cephalic-and right hand corner of the pericardium to the left hind limb. Note the sinus deflections at O. points. It has been awakened by impulses which have traversed the auriculo-ventricular bundle, its main divisions and their arborisations. This is a conclusion which applies to the