Respiratory reflexes in spontaneously breathing anesthetized dogs in response to nasal administration of sevoflurane, isoflurane, or halothane

Tatsushi Mutoh, Arata Kanamaru, Hodaka Suzuki, Hirokazu Tsubone, Ryohci Nishimura, Nobuo Sasaki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Objective - To characterize respiratory reflexes elicited by nasal administration of sevoflurane (Sevo), isoflurane (Iso), or halothane (Hal) in anesthetized dogs. Animals - 8 healthy Beagles. Procedure - A permanent tracheostomy was created in each dog. Two to 3 weeks later, dogs were anesthetized by IV administration of thiopental and α-chloralose. Nasal passages were isolated such that inhalant anesthetics could be administered to the nasal passages while the dogs were breathing 100% O2 via the tracheostomy. Respiratory reflexes in response to administration of each anesthetic at 1.2 and 2.4 times the minimum alveolar concentration (MAC) and the full vaporizer setting (5%) were recorded. Reflexes in response to administration of 5% of each anesthetic also were recorded following administration of lidocaine to the nasal passages. Results - Nasal administration of Sevo, Iso, and Hal induced an immediate ventilatory response characterized by a dose-dependent increase in expiratory time and a resulting decrease in expired volume per unit of time. All anesthetics had a significant effect, but for Sevo, the changes were smaller in magnitude. Responses to administration of each anesthetic were attenuated by administration of lidocaine to the nasal passages. Conclusions and Clinical Relevance - Nasal administration of Sevo at concentrations generally used for mask induction of anesthesia induced milder reflex inhibition of breathing, presumably via afferent neurons in the nasal passages, than that of Iso or Hal. Respiratory reflexes attributable to stimulation of the nasal passages may contribute to speed of onset and could promote a smoother induction with Sevo, compared with Iso or Hal.

Original languageEnglish
Pages (from-to)311-319
Number of pages9
JournalAmerican Journal of Veterinary Research
Volume62
Issue number3
DOIs
Publication statusPublished - 2001 Mar
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)

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