The effects of sevoflurane, enflurane, and isoflurane on baroreceptor-sympathetic reflex in rabbits.

Published

Journal Article

This study was designed to determine the effects of sevoflurane, enflurane, and isoflurane ranging from 0.5 to 1.25 minimum alveolar anesthetic concentration (MAC) on spontaneous efferent renal sympathetic nerve activity (RNA) and the barorecptor-sympathetic reflex in rabbits. Enflurane produced significant decreases in spontaneous RNA by 22.5% +/- 6.6% at 1.0 MAC, while sevoflurane and isoflurane, at the equivalent MAC, did not. All of the anesthetics attenuated the baroreflex gain similarly when mean blood pressure (MBP) was changed by sodium nitroprusside or phenylephrine intravenously. However, the sensitivity of baroreceptors at the aortic wall was not changed by any anesthetic, because no changes in the relationship between aortic nerve activity and MBP were obtained in anesthetic concentration even at 1.25 MAC. Furthermore, these anesthetics suppressed the sympathoinhibitory response to aortic nerve stimulation above 1.0 MAC. In conclusion, enflurane inhibits RNA to a greater degree than sevoflurane or isoflurane. However, all three anesthetics depress the reflex regulation of RNA to the same degree. The suppression on the baroreceptor-sympathetic reflex does not appear to be related to a change in the receptor sensitivity on the aorta, but is mediated by suppression of the central or peripheral sympathetic integrating system.

Full Text

Cited Authors

  • Saeki, Y; Hasegawa, Y; Shibamoto, T; Yamaguchi, Y; Hayashi, T; Tanaka, S; Wang, HG; Koyama, S

Published Date

  • February 1996

Published In

Volume / Issue

  • 82 / 2

Start / End Page

  • 342 - 348

PubMed ID

  • 8561339

Pubmed Central ID

  • 8561339

Electronic International Standard Serial Number (EISSN)

  • 1526-7598

International Standard Serial Number (ISSN)

  • 0003-2999

Digital Object Identifier (DOI)

  • 10.1097/00000539-199602000-00023

Language

  • eng