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Effects of thiopent...
Effects of thiopental on resistance vessels in cat skeletal muscle
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- Grände, P O (författare)
- Lund University,Lunds universitet,Anestesiologi och intensivvård,Sektion II,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Anesthesiology and Intensive Care,Section II,Department of Clinical Sciences, Lund,Faculty of Medicine,Skåne University Hospital
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- Gustafsson, D (författare)
- Lund University
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- Lindberg, L (författare)
- Lund University,Lunds universitet,Anestesiologi och intensivvård,Sektion II,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Barnanestesi och intensivvård,Forskargrupper vid Lunds universitet,Anesthesiology and Intensive Care,Section II,Department of Clinical Sciences, Lund,Faculty of Medicine,Pediatric anesthesia and intensive care,Lund University Research Groups
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(creator_code:org_t)
- 1990
- 1990
- Engelska.
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Ingår i: Intensive Care Medicine. - 0342-4642. ; 16:6, s. 399-404
- Relaterad länk:
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https://lup.lub.lu.s...
Abstract
Ämnesord
Stäng
- Barbiturates are used clinically as anaesthetics and to reduce raised intracranial pressure. One side effect is hypotension, usually ascribed to a depression of cardiac contractility, while their effects on the resistance vessels are more controversial: both vasodilation and vasoconstriction have been described. This study analyzes the effects of thiopental on basal vascular tone in the cat skeletal muscle. We found that total resistance increased by almost 20% at low (50 mumol/l) and decreased down to about 50% of control at high (350 mumol/l) plasma concentrations of thiopental. The vasoconstriction dominated in the large arterioles (i.d. greater than 25 microns) and the vasodilation in the small arterioles (i.d. less than 25 microns). A dose-dependent inhibition of myogenic vascular reactivity (here defined as the maximum resistance increase to a transient rise in transmural pressure) coincided with the vasodilation. Autoregulation of blood flow was depressed by thiopental. During vasoconstriction there was a net transcapillary fluid absorption and during vasodilation a net fluid filtration. The fluid movements could be ascribed to variations in capillary hydrostatic pressure. If applicable to the cerebral circulation these results suggest that thiopental at high plasma concentrations might induce, instead of reduce, interstitial brain oedema.
Ämnesord
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Anestesi och intensivvård (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Anesthesiology and Intensive Care (hsv//eng)
Nyckelord
- Animals
- Blood Flow Velocity
- Capillary Resistance
- Cats
- Dose-Response Relationship, Drug
- Injections, Intra-Arterial
- Muscle Tonus
- Muscles
- Thiopental
- Vascular Resistance
- Journal Article
- Research Support, Non-U.S. Gov't
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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