Veterinary Medicine Volume 7

Veterinary Medicine Volume 7

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ... causes which diminish the quantity of chloroform necessary to produce anesthesia lessen danger of cardiac syncope. Cardiac syncope has been attributed to excitation of the pneumogastric nerve or its bulbar nucleus by chloroform. It is said that by paralyzing the pneumogastric scopolamine prevents syncope, but this we doubt. Conclusions.--1. Scopolamine accelerates the heart-beats, augments bloodpressure, increases respiratory movements. It modifies the peripheral nervous system, suppressing the pneumogastric in the dog and moderating its action in the rabbit. One dose does not observe any appreciable modification of the sympathetic; it has no action on the depressor nerve. It increases the excitability of the nervous centers at first, and depresses them afterwards. 2. Scopolamine is an important auxiliary in chloroform anesthesia, this effect being obtained in a shorter time and with less chloroform. 3. This action of scopolamine is due to two modifications on the system; (a) On the central nervous system; (b) on the circulation and respiration. 4. Fatigue affects anesthesia by chloroform in the same way and by the same mechanism as scopolamine. 5. The quantity of chloroform employed being much reduced, the cerebral troubles produced disappear rapidly, the animal wakes quickly, and sensibility is rapidly re-established. Only dilatation of the pupil remains for twenty-four "hours, and sometimes longer. 6. Scopolamine prevents cardiac syncope, not by paralyzing the pneumogastric but by reducing the quantity of chloroform employed; one thus avoids heart intoxication. 7. Mixed anesthesia by chloroform plus scopolamine is recommended on one condition only; one must not push anesthesia, too far, for respiratory syncope once.produced, the...
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Product details

  • Paperback
  • 189 x 246 x 23mm | 789g
  • United States
  • English
  • black & white illustrations
  • 1236849167
  • 9781236849168