Effects of perineural capsaicin treatment on cardiopulmonary reflexes elicited by laryngeal instillations of capsaicin and distilled water in sevoflurane-anesthetized dogs.
The aim of this study was to determine the effect of perineural capsaicin (CAPS) treatment on cardiopulmonary reflexes elicited by topical laryngeal instillation of CAPS and distilled water (DW) in sevoflurane-anesthetized dogs. Cardiopulmonary reflexes elicited by CAPS (10 microg/ml, 10 ml) were attenuated by perineural CAPS treatment to the superior laryngeal nerves (SLNs) (P<0.05), whereas those by DW (10 ml) remained unaffected (P>0.05). The reflex responses to DW that remained even after the perineural CAPS treatment were eliminated by laryngeal anesthesia with lidocaine. These results suggest that cardiopulmonary reflexes from the laryngeal mucosa elicited by CAPS instillation can be blocked by perineural CAPS treatment to the SLNs, which may result from inhibition of the laryngeal CAPS-sensitive C-fiber afferents.
Mutoh
T
T
Department of Veterinary Surgery, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan.
Kanamaru
A
A
Kojima
K
K
Nishimura
R
R
Sasaki
N
N
Tsubone
H
H
D000758:Anesthesia / Q000662:veterinary; D018685:Anesthetics, Inhalation; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002211:Capsaicin / Q000494:pharmacology*; D004285:Dogs / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D017214:Laryngeal Masks / Q000662:veterinary; D007823:Laryngeal Nerves / Q000187:drug effects* / Q000502:physiology; D007830:Larynx / Q000502:physiology; D008012:Lidocaine / Q000008:administration & dosage; D008297:Male; D008738:Methyl Ethers; D012018:Reflex / Q000187:drug effects*; D012119:Respiration / Q000187:drug effects; D012129:Respiratory Function Tests / Q000662:veterinary; D000077149:Sevoflurane; D014867:Water / Q000502:physiology
D018685:Anesthetics, Inhalation; D008738:Methyl Ethers; D014867:Water; D000077149:Sevoflurane; D008012:Lidocaine; D002211:Capsaicin