| Leukotriene D4-induced vasoconstriction of coronary arteries in anaesthetized dogs. | |
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MedLine Citation:
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PMID: 6723695 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We examined in pentobarbital-anaesthetized dogs, the effects of intracoronary leukotriene D4 (LTD4) on large vessel (circumflex artery) flow and diameter and on calculations of late diastolic and total coronary resistance. Heart rate, systolic and end-diastolic ventricular pressures and the dP/dt were the haemodynamic variables studied. The peripheral ECG was obtained in lead II. LTD4 (0.1-10 micrograms kg-1) reduced coronary diameter up to 12 +/- 3% (mean +/- s.e.m.). Coronary flow decreased in dose-dependent fashion up to 100%. Blood flow returned to control values within 3-15 min of LTD4 administration. Blood pressure, heart rate and ventricular pressure did not change while LV dP/dtmax fell and filling pressure increased. The sum of ST segments and R wave voltages of the ECG increased indicating transient myocardial ischaemia during LTD4-induced coronary blood flow cessation. Small vessel and total coronary resistance rose in a dose-dependent manner between 33-232% and 50-500%, respectively. Inhibition of cyclo-oxygenase enzyme (indomethacin, 5 mg kg-1, i.v.) and lipoxygenase enzymes (nafazatrom, 10 mg kg-1, i.d.) had no effect on LTD4-caused alterations in coronary flow, resistance and arterial diameter. Thus, in canine experiments the intracoronary administration of LTD4 can constrict coronary arteries--presumably large conductive vessels. This is independent of the cyclooxygenase and additional lipoxygenase metabolites of the arachidonic acid pathway other than LTD4. Therefore, the agent may contribute to cardiac dysfunction in coronary artery disease and spasm. |
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Authors:
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V B Fiedler; M Mardin; T S Abram |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: European heart journal Volume: 5 ISSN: 0195-668X ISO Abbreviation: Eur. Heart J. Publication Date: 1984 Mar |
Date Detail:
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Created Date: 1984-06-27 Completed Date: 1984-06-27 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8006263 Medline TA: Eur Heart J Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 253-60 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Coronary Circulation / drug effects Coronary Vessels / drug effects*, physiology Dogs Dose-Response Relationship, Drug Electrocardiography Female Hemodynamics / drug effects Indomethacin / pharmacology Male Myocardial Contraction / drug effects Regression Analysis SRS-A / administration & dosage, pharmacology* Vascular Resistance / drug effects Vasoconstriction / drug effects* |
| Chemical | |
Reg. No./Substance:
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0/SRS-A; 53-86-1/Indomethacin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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