Effect of norepinephrine, epinephrine, and angiotensin on blood flow in the internal carotid artery of man.

Published

Journal Article

Internal carotid artery blood flow and arterial pressure were measured with a sine-wave electromagnetic flowmeter and a pressure transducer in 22 patients during control period and after the intravenous and intracarotid administration of norepinephrine, epinephrine, and angiotensin. Intravenous infusion of both norepinephrine and angiotensin was accompanied by an increase in cerebral vascular resistance. Administration of norepinephrine, epinephrine, and angiotensin into the internal carotid artery failed to alter blood flow immediately. However, when the systemic blood pressure increased, a concomitant passive rise in blood flow did not occur. Thus, at this time cerebral vascular resistance was significantly increased. It is concluded that these drugs do not have a direct action on the cerebral vessels, but that the increased cerebral vascular resistance after their administration is due to autoregulation or to a combination of autoregulation and reduced arterial carbon dioxide pressure (P(CO2)) secondary to hyperventilation. Similar studies were carried out in the external carotid artery of six patients. Within 10 sec after injection blood flow was markedly reduced, indicating a direct vasoconstricting action on this vascular bed.

Full Text

Duke Authors

Cited Authors

  • Greenfield, JC; Tindall, GT

Published Date

  • July 1, 1968

Published In

Volume / Issue

  • 47 / 7

Start / End Page

  • 1672 - 1684

PubMed ID

  • 4298077

Pubmed Central ID

  • 4298077

International Standard Serial Number (ISSN)

  • 0021-9738

Digital Object Identifier (DOI)

  • 10.1172/JCI105858

Language

  • eng

Conference Location

  • United States