Effects of nitrous oxide and volatile anaesthetics on cerebral blood flow.


Journal Article

Nitrous oxide and halogenated anaesthetic agents are often administered concurrently during neuroanaesthesia. To assess the interactive effects of these agents on cerebral blood flow (CBF), we have measured CBF by 14C-iodoantipyrine autoradiography, in normocapnic rats receiving either 0.5 or 1.0 MAC of volatile agent alone (halothane or isoflurane) or 0.5 MAC of volatile agent + 0.5 MAC nitrous oxide. CBF (global and regional) was significantly greater at 1.0 MAC compared with 0.5 MAC, regardless of how 1.0 MAC was achieved (agent alone or agent + nitrous oxide) (P less than 0.05). The addition of 0.5 MAC nitrous oxide to 0.5 MAC halothane resulted in flows similar to those produced by 1.0 MAC halothane alone. In contrast, the addition of nitrous oxide to 0.5 MAC isoflurane resulted in flow values significantly greater than those measured during 1.0 MAC isoflurane alone. We conclude that the use of nitrous oxide, as opposed to an increased dose of volatile agent, has no advantage in respect of minimizing anaesthetic-induced increases in cerebral blood flow.

Full Text

Duke Authors

Cited Authors

  • Hansen, TD; Warner, DS; Todd, MM; Vust, LJ

Published Date

  • September 1989

Published In

Volume / Issue

  • 63 / 3

Start / End Page

  • 290 - 295

PubMed ID

  • 2803887

Pubmed Central ID

  • 2803887

International Standard Serial Number (ISSN)

  • 0007-0912

Digital Object Identifier (DOI)

  • 10.1093/bja/63.3.290


  • eng

Conference Location

  • England