| Coronary input impedance during cardiac cycle as determined by impulse response method. | |
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MedLine Citation:
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PMID: 3618806 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The coronary arterial system was characterized by its input impedance determined in systole and diastole from impulse response functions in five dogs. The impulse response technique was verified on a known hydraulic system. A second confirmation was obtained on the circumflex artery: reflected pulses were correlated with site of reflections generated by occlusions. The impulse response indicates discrete reflections, superimposed on the tail of the response, resulting from diffuse reflections. Input impedance was calculated from Fourier analysis of the impulse response. Characteristic impedance was 1.0 +/- 0.2 X 10(9) Pa X s X m-3 (0.13 +/- 0.02 mmHg X ml-1 X min) and impedance at 0 Hz was 2.6 +/- 0.8 X 10(9) Pa X s X m-3. No significant differences between systole and diastole were found in both characteristic impedance and impedance at 0 Hz. It is concluded that the coronary system consists of a proximal part that can be described with the three-element windkessel and a distal part not seen by oscillatory pressure or flow perturbations, which depends on the phase of cardiac contraction. |
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Authors:
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G A Van Huis; P Sipkema; N Westerhof |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The American journal of physiology Volume: 253 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1987 Aug |
Date Detail:
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Created Date: 1987-09-17 Completed Date: 1987-09-17 Revised Date: 2003-11-14 |
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: H317-24 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 Cardiology / methods* Coronary Circulation* Dogs Heart / physiology* Male Models, Cardiovascular Vascular Resistance* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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