| Effects of hemorrhage and naloxone on adrenal release of methionine-enkephalin and catecholamines in halothane anesthetized dogs. | |
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MedLine Citation:
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PMID: 3440817 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Concurrent levels of methionine-enkephalin and catecholamines in adrenal vein, femoral vein and femoral artery were measured under baseline conditions and during graded hemorrhage in halothane anesthetized dogs and compared to a non-bled control group. Naloxone was administered in both groups at the end of the experiment. Normotensive hypovolemia with a remaining blood volume of 76% led to a moderate decrease in mean arterial blood pressure from baseline and a 15- to 20-fold increase in norepinephrine, epinephrine and dopamine, and a 5-fold increase in enkephalin in the adrenal vein. Subsequent induction of hypotensive hypovolemia with a remaining blood volume of 51% resulted in a profound drop in blood pressure and evoked a further increase in the level of catecholamines (40- to 50-fold from baseline) and enkephalin (8-fold from baseline) in the adrenal vein. In the control group only a 3- to 4-fold increase from baseline in adrenal vein hormone levels was observed over time. Naloxone administration at the end of the experiment, led to a 2- to 6-fold further increase in hormones at the 3 collection sites in both groups of dogs. Joint calculation of the partial correlation coefficients for the influence of preceding blood volume and blood pressure, and concurrent blood volume and blood pressure on hormone secretion in the adrenal vein revealed that these variables explained the variation in hormone levels between 56 and 92% during normotensive hypovolemia and 62-83% during hypotensive hypovolemia. In one dog with bilateral adrenalectomy, hemorrhage was poorly tolerated, and naloxone administration did not lead to increased systemic plasma levels of catecholamines and enkephalin or improved hemodynamics. In the hemorrhage group, molar ratios of norepinephrine/epinephrine in the adrenal vein showed a significant increasing trend during the experiment. Findings in these experiments support the idea of differential monoaminergic and enkephalinergic regulation in adrenal medullary cells. |
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Authors:
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D M Gaumann; T L Yaksh; M K Dousa; G M Tyce; D L Lucas; V S Hench |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Journal of the autonomic nervous system Volume: 21 ISSN: 0165-1838 ISO Abbreviation: J. Auton. Nerv. Syst. Publication Date: 1987 Nov |
Date Detail:
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Created Date: 1988-04-18 Completed Date: 1988-04-18 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8003419 Medline TA: J Auton Nerv Syst Country: NETHERLANDS |
Other Details:
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Languages: eng Pagination: 29-41 Citation Subset: IM |
Affiliation:
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Department of Anesthesiology, Mayo Clinic, Rochester, MN 55905. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adrenal Glands
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drug effects,
secretion* Animals Blood Pressure Catecholamines / secretion* Dogs Dopamine / secretion Enkephalin, Methionine / secretion* Epinephrine / secretion Female Halothane Heart Rate Hemorrhage / physiopathology* Kinetics Male Naloxone / pharmacology* Norepinephrine / secretion Reference Values |
| Grant Support | |
ID/Acronym/Agency:
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AM-34988/AM/NIADDK NIH HHS; NS-16541/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Catecholamines; 151-67-7/Halothane; 465-65-6/Naloxone; 51-41-2/Norepinephrine; 51-43-4/Epinephrine; 58569-55-4/Enkephalin, Methionine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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