Effects of Perineural Capsaicin Treatment on Cardiopulmonary Reflexes Elicited by Laryngeal Instillations of Capsaicin and Distilled Water in Sevoflurane-Anesthetized Dogs

Tatsushi MUTOH, Arata KANAMARU, Kentaro KOJIMA, Ryohei NISHIMURA, Nobuo SASAKI, Hirokazu TSUBONE
2000 Journal of Veterinary Medical Science  
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 µg/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
more » ... ed 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.-KEY WORDS: canine, control of breathing, laryngeal afferents.
doi:10.1292/jvms.62.665 pmid:10907699 fatcat:zw4t6csy3rbt3bpf4cmxdxzcwa