| Interpretation of pulsatility index in feeder arteries to low-impedance vascular beds. | |
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MedLine Citation:
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PMID: 12797068 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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A simple electrical circuit is proposed as a model for peripheral vascular beds of low impedance. The model consists of a flow and pressure source, i.e. the 'feeder' artery, with the vascular bed represented by a Zener diode Z giving rise to a 'back pressure' P(z) and a pure resistance R. By applying Ohm's law to the definition of pulsatility index PI(flow) of flow in the feeder artery, it is shown that PI(flow) is dependent only on the mean blood pressure (input), the pulse pressure and P(z), and is independent of R. For those vascular beds where the impedance is largely resistive, e.g. the brain, the kidney and the uterine-placental complex, it is suggested that P(z) may be a more useful characterizing parameter than the value of PI(flow) as at present used by some workers. |
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Authors:
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R G Gosling; P T Lo; M G Taylor |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology Volume: 1 ISSN: 0960-7692 ISO Abbreviation: Ultrasound Obstet Gynecol Publication Date: 1991 May |
Date Detail:
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Created Date: 2003-06-10 Completed Date: 2005-03-22 Revised Date: 2009-11-03 |
Medline Journal Info:
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Nlm Unique ID: 9108340 Medline TA: Ultrasound Obstet Gynecol Country: England |
Other Details:
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Languages: eng Pagination: 175-9 Citation Subset: - |
Copyright Information:
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Copyright 1991 International Society of Ultrasound in Obstetrics and Gynecology |
Affiliation:
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Ultrasonic Angiology Unit, Division of Radiological Sciences, United Medical Schools of Guy's and St. Thomas', University of London, UK. |
Export Citation:
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Descriptor/Qualifier:
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| Comments/Corrections | |
Comment In:
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Ultrasound Obstet Gynecol. 1991 May 1;1(3):160-1
[PMID:
12797065
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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