| Severity of canine myocardial infarcts in relation to indices of oxygen demand: preservation of myocardial creatine kinase activity by vagal stimulation and propranolol. | |
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MedLine Citation:
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PMID: 6850717 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The left anterior descending coronary artery was ligated in 58 open-chest anaesthetised dogs; 23 were controls, 15 were given intravenous propranolol 1 mg . kg-1 before and at 6 h intervals after coronary ligation, nine had bilateral cervical vagal nerve stimulation (VS) before and for 4 to 6 h after coronary ligation, and 11 had both VS and propranolol. None of the 20 dogs undergoing VS developed ventricular fibrillation within the first hour after coronary ligation compared to nine of the remaining 38 (P less than 0.05). Compared to controls, myocardial creatine kinase (CK) depletion in the epicardial layer of the infarct centre measured 24 h after coronary ligation was significantly less in the groups treated separately with vagal nerve stimulation and propranolol. Myocardial blood flow (MBF) measured at 15 min after coronary ligation was reduced to the normal myocardium by the interventions, but was unchanged at the infarct centre. Severely ischaemic myocardium (MBF less than or equal to 20% of normal) was better protected by the interventions than was moderately ischaemic myocardium. At 15 min after coronary ligation, the heart rate--blood pressure product (RPP) was reduced compared with controls by propranolol (18% reduction, P less than 0.05), reduced more by vagal stimulation (by 37%, P less than 0.001) and still more by vagal stimulation with propranolol (by 43%, P less than 0.001). Preservation of CK in myocardium with MBF less than or equal to 20% of normal was improved by VS and propranolol given separately roughly in proportion to reduction in RPP, but further reduction in RPP by VS and propranolol together did not improve CK levels further. We conclude that there may be an optimum level of indices of oxygen demand for preservation of very ischaemic myocardium in experimental infarction. |
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Authors:
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N L Sammel; R M Norris; C F Hughes; R N Johnson; N G Ashton; R L Elliott |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Cardiovascular research Volume: 17 ISSN: 0008-6363 ISO Abbreviation: Cardiovasc. Res. Publication Date: 1983 Jan |
Date Detail:
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Created Date: 1983-07-08 Completed Date: 1983-07-08 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0077427 Medline TA: Cardiovasc Res Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 50-60 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 Creatine Kinase / metabolism* Dogs Electric Stimulation Hemodynamics Myocardial Infarction / enzymology, metabolism, physiopathology* Myocardium / enzymology, metabolism* Oxygen Consumption* / drug effects Propranolol / pharmacology* Vagus Nerve / physiopathology* |
| Chemical | |
Reg. No./Substance:
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525-66-6/Propranolol; EC 2.7.3.2/Creatine Kinase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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