Effect of preanesthetic medication on ease of endoscopic intubation of the duodenum in anesthetized dogs

Lydia L. Donaldson From the Marion duPont Scott Equine Medical Center, Virginia-Maryland Regional College of Veterinary Medicine, Leesburg, VA 22075 (Donaldson), the Department of Small Animal Clinical Science, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, VA 24061-0202 (Leib, Boyd, Burkholder), and Institute of Research and Education, Falls Church, VA 22042 (Sheridan).

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Michael S. Leib From the Marion duPont Scott Equine Medical Center, Virginia-Maryland Regional College of Veterinary Medicine, Leesburg, VA 22075 (Donaldson), the Department of Small Animal Clinical Science, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, VA 24061-0202 (Leib, Boyd, Burkholder), and Institute of Research and Education, Falls Church, VA 22042 (Sheridan).

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Christie Boyd From the Marion duPont Scott Equine Medical Center, Virginia-Maryland Regional College of Veterinary Medicine, Leesburg, VA 22075 (Donaldson), the Department of Small Animal Clinical Science, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, VA 24061-0202 (Leib, Boyd, Burkholder), and Institute of Research and Education, Falls Church, VA 22042 (Sheridan).

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William Burkholder From the Marion duPont Scott Equine Medical Center, Virginia-Maryland Regional College of Veterinary Medicine, Leesburg, VA 22075 (Donaldson), the Department of Small Animal Clinical Science, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, VA 24061-0202 (Leib, Boyd, Burkholder), and Institute of Research and Education, Falls Church, VA 22042 (Sheridan).

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Michael Sheridan From the Marion duPont Scott Equine Medical Center, Virginia-Maryland Regional College of Veterinary Medicine, Leesburg, VA 22075 (Donaldson), the Department of Small Animal Clinical Science, Virginia-Maryland Regional College of Veterinary Medicine, Blacksburg, VA 24061-0202 (Leib, Boyd, Burkholder), and Institute of Research and Education, Falls Church, VA 22042 (Sheridan).

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Summary

The effects of preanesthetic medication on ease of duodenal endoscopic intubation in dogs was evaluated. One of 12 combinations of preanesthetic medications (using atropine, glycopyrrolate, morphine, meperidine, acepromazine, and 0.9% NaCl solution) was administered im to each of 12 dogs in a trial. Twelve endoscopic trials were performed so that each dog received each treatment combination once. Anesthesia was induced with thiamylal administered iv and maintained with halothane vaporized in oxygen. Electrocardiographic recordings, indirect blood pressure measurements, end-tidal carbon dioxide partial pressures, and halothane concentrations were monitored during the anesthetic period. The ease with which the fiberoptic endoscope was passed into the proximal portion of the duodenum was qualitatively scored on the basis of time and maneuvering effort. None of the preanesthetic combinations made intubation of the duodenum significantly easier than that with 0.9% NaCl solution (control). Only the combmation of morphine and atropine induced gastropyloric conditions that resulted in significantly higher (more difficult) endoscopic scores than those after preanesthetic medication with 0.9% NaCl solution.

Summary

The effects of preanesthetic medication on ease of duodenal endoscopic intubation in dogs was evaluated. One of 12 combinations of preanesthetic medications (using atropine, glycopyrrolate, morphine, meperidine, acepromazine, and 0.9% NaCl solution) was administered im to each of 12 dogs in a trial. Twelve endoscopic trials were performed so that each dog received each treatment combination once. Anesthesia was induced with thiamylal administered iv and maintained with halothane vaporized in oxygen. Electrocardiographic recordings, indirect blood pressure measurements, end-tidal carbon dioxide partial pressures, and halothane concentrations were monitored during the anesthetic period. The ease with which the fiberoptic endoscope was passed into the proximal portion of the duodenum was qualitatively scored on the basis of time and maneuvering effort. None of the preanesthetic combinations made intubation of the duodenum significantly easier than that with 0.9% NaCl solution (control). Only the combmation of morphine and atropine induced gastropyloric conditions that resulted in significantly higher (more difficult) endoscopic scores than those after preanesthetic medication with 0.9% NaCl solution.

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