Determination of the ED50 of isoflurane and evaluation of the isoflurane-sparing effect of butorphanol in cockatoos (Cacatua spp.).

T. G. Curro, D. B. Brunson, Joanne R Paul-Murphy

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

The use of butorphanol as an analgesic in a psittacine species was evaluated by determining its isoflurane-sparing effects. The Effective Dose 50 (ED50) of isoflurane was determined using a bracketing technique based on the purposeful movement elicited by pressure applied to a digit with a hemostat. The ED50 of isoflurane for 11 cockatoos (four greater sulfur crested, three lesser sulfur crested, and four citron crested) was determined to be 1.44 +/- 0.07%. After the administration of 1 mg/kg of butorphanol tartrate intramuscularly (IM), the ED50 was significantly (P < .05) decreased to 1.08 +/- 0.05%. Physiological variables that changed significantly included decreases in heart rate, tidal volume (Vt), inspiratory (Ti) and expiratory times (Te), and an increase in respiratory rate. No complications resulted because of these changes. Based on the results, butorphanol produces an isoflurane-sparing effect in cockatoos and has the potential to be a useful analgesic in psittacines.

Original languageEnglish (US)
Pages (from-to)429-433
Number of pages5
JournalVeterinary surgery : VS : the official journal of the American College of Veterinary Surgeons
Volume23
Issue number5
StatePublished - Sep 1994
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)

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