| Intracoronary infusion of prostaglandin I2 attenuates arterial baroreflex control of heart rate in conscious dogs. | |
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MedLine Citation:
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PMID: 3052904 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Prostaglandin I2 (PGI2) is known to stimulate ventricular C fiber receptors resulting in a Bezold-Jarisch-like reflex. Also, cardiac receptor stimulation is known to interact with the expression of arterial baroreflexes. Therefore, experiments were performed to determine the effects of left circumflex coronary artery infusion of PGI2 on the baroreflex control of heart rate in conscious instrumented dogs. Dogs were instrumented chronically with an aortic catheter for the measurement of mean aortic pressure, hydraulic occluder cuffs on the descending aorta and inferior vena cava, a left ventricular catheter for the measurement of left ventricular pressure and heart rate, and a nonocclusive catheter in the left circumflex coronary artery. At the time of experimentation, arterial pressure was altered randomly in steps by partially inflating the occluders. Mean arterial pressure-heart curves (baroreflex curves) were constructed by fitting the data to a logistic curve by nonlinear regression. PGI2 infused into the left circumflex coronary artery at doses of 10, 20, and 50 ng/kg/min caused significant (p less than 0.05) inhibition of the maximum heart rate, heart rate range, and maximum slope of the curve compared to the control baroreflex curve obtained during intracoronary infusion of PGI2 vehicle. PGI2 had no significant effect on the minimum heart rate during hypertension. Since PGI2 is known to stimulate left ventricular receptors, these effects were most likely produced via stimulation of cardiac receptors. In additional experiments using beta 1-blockade with metoprolol or cholinergic blockade with atropine methyl bromide, it was shown that PGI2 attenuates baroreflex-mediated tachycardia by preventing parasympathetic withdrawal completely and by attenuating sympathetic stimulation by approximately 50%.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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M J Panzenbeck; W Tan; M A Hajdu; I H Zucker |
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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: Circulation research Volume: 63 ISSN: 0009-7330 ISO Abbreviation: Circ. Res. Publication Date: 1988 Nov |
Date Detail:
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Created Date: 1988-12-09 Completed Date: 1988-12-09 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0047103 Medline TA: Circ Res Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 860-8 Citation Subset: IM |
Affiliation:
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Department of Physiology and Biophysics, University of Nebraska College of Medicine, Omaha 68105. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Atropine / pharmacology Coronary Vessels / drug effects*, physiology Dogs Dose-Response Relationship, Drug Epoprostenol / administration & dosage, pharmacology* Female Heart Rate / drug effects* Infusions, Intra-Arterial Male Metoprolol / pharmacology Pressoreceptors / drug effects*, physiology Reflex / drug effects* |
| Grant Support | |
ID/Acronym/Agency:
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HL-07241/HL/NHLBI NIH HHS; HL-33359/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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35121-78-9/Epoprostenol; 37350-58-6/Metoprolol; 51-55-8/Atropine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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