Microsphere analysis of β2-adrenergic control of resistance in different vascular areas after hemorrhage
- 1 June 1984
- journal article
- research article
- Published by Wiley in Acta Physiologica Scandinavica
- Vol. 121 (2), 119-126
- https://doi.org/10.1111/j.1748-1716.1984.tb07437.x
Abstract
In cats exposed to bleeding (exsanguination of 15 ml/kg bwt [body wt]) the microsphere technique was used to determine regional vascular resistances in a large number of tissues before and after i.v. administration of the selective .beta.2-adrenoceptor antagonist ICI 118,551 [erythro-dl-1-(7-methylindan-4-yloxy)-3-isopropylaminobutan-2-ol] .beta.2-blockade significantly raised vascular resistance in the stomach (+26%), small (+25%) and large (+38%) intestine, pancreas (+29%), kidney (+39%), omental (+33%) and s.c. (+26%) fat, white skeletal muscle (+19%) and skin (+24%). With intact .beta.-adrenoceptors, .beta.2-adrenergic dilator interaction apparently counteracted the hemorrhage evoked vasoconstrictor influences. .beta.2-blockade also evoked quite a strong increase of total peripheral resistance (19%) and led to some redistribution of cardiac output. .beta.2-adrenergic inhibition of vascular tone seems to improve tissue perfusion significantly during bleeding in several vascular areas. Such effects may be of special significance during severe hemorrhage. In the intestine, pancreas and adipose tissue, for example, protection against excessive vasoconstriction may serve to minimize the severe metabolic disturbances with secondary release of toxic factors into the circulation reported during hemorrhagic shock.Keywords
This publication has 20 references indexed in Scilit:
- Influence of circulating NE and Epi on adipose tissue vascular resistance and lipolysis in humansAmerican Journal of Physiology-Heart and Circulatory Physiology, 1983
- The Pharmacology of a β2-Selective Adrenoceptor Antagonist (ICI 118,551)Journal of Cardiovascular Pharmacology, 1983
- β2‐adrenergic control of plasma volume in hemorrhageActa Physiologica Scandinavica, 1982
- Influences on central hemodynamics in hemorrhage of β2-adrenergic vascular control mechanismsActa Physiologica Scandinavica, 1982
- Impairment during marked hypotension of the plasma volume control in hemorrhageActa Physiologica Scandinavica, 1982
- AN INVESTIGATION INTO THE TYPE OF β‐ADRENOCEPTOR MEDIATING SYMPATHETICALLY ACTIVATED RENIN RELEASE IN THE CATBritish Journal of Pharmacology, 1981
- Beta-adrenergic control of peripheral vascular resistance during increased sympatho-adrenal activityActa Physiologica Scandinavica, 1981
- Beta-adrenergic dilator interaction with the constrictor response in resistance vessels of skeletal muscle during hemorrhageActa Physiologica Scandinavica, 1980
- Blood flow measurements with radionuclide-labeled particlesProgress in Cardiovascular Diseases, 1977
- Some sources of error in measuring regional blood flow with radioactive microspheres.Journal of Applied Physiology, 1971