| Phasic characteristics of arterial inflow and venous outflow of right ventricular myocardium in dogs. | |
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MedLine Citation:
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PMID: 1590447 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To clarify the characteristics and causes of phasic blood flow in coronary circulation of the right ventricle we measured blood velocities in peripheral portions of the right coronary artery and vein in dogs under three conditions: control, transient pulmonary stenosis, and isoproterenol administration. An optical fiber sensor of a laser Doppler velocimeter was fixed onto the vessels (150-500 microns OD) with cyanoacrylate. The phasic pattern of distal arterial velocity was compared with the proximal velocity in the right coronary artery measured with an ultrasound pulsed Doppler velocimeter. Systolic-to-total velocity area ratio in the small epicardial artery [0.38 +/- 0.03 (SE)] was found to be smaller than in the large epicardial artery (0.51 +/- 0.02, P less than 0.01), indicating a capacitive filling of the epicardial artery during systole. The velocity waveform in small right coronary veins was predominantly systolic; i.e., it increased with a rise of right ventricular pressure and decreased with right ventricular relaxation. Comparison of the waveforms during isoproterenol infusion and pulmonary stenosis indicates that contraction of the ventricle is more important than right ventricular systolic pressure in retarding arterial inflow and accelerating venous outflow. |
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Authors:
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O Hiramatsu; A Kimura; T Yada; T Yamamoto; Y Ogasawara; M Goto; K Tsujioka; F Kajiya |
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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: The American journal of physiology Volume: 262 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1992 May |
Date Detail:
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Created Date: 1992-06-24 Completed Date: 1992-06-24 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: H1422-7 Citation Subset: IM |
Affiliation:
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Department of Medical Engineering and Systems Cardiology, Kawasaki Medical School, Kurashiki, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Arteries Blood Flow Velocity Coronary Circulation / physiology* Dogs Female Fiber Optic Technology Heart Ventricles Hemodynamics / drug effects Isoproterenol / pharmacology Male Nitroglycerin / pharmacology Optical Fibers Pericardium Ultrasonics Veins |
| Chemical | |
Reg. No./Substance:
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55-63-0/Nitroglycerin; 7683-59-2/Isoproterenol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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