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Problems related to the assessment of fluid velocity and volume flow in valve regurgitation using ultrasound Doppler technique.
Linköping University, Department of Medicine and Care, Clinical Physiology. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Heart and Medicine Center, Department of Clinical Physiology in Linköping.
Linköping University, Department of Biomedical Engineering, Physiological Measurements. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Applied Thermodynamics and Fluid Mechanics. Linköping University, The Institute of Technology.
1987 (English)In: European Heart Journal, ISSN 0195-668X, E-ISSN 1522-9645, Vol. 8 Suppl C, 29-33 p.Article in journal (Refereed) Published
Abstract [en]

Understanding of the factors affecting regurgitant flow through a heart valve and of the inherent limitations of the Doppler technique is needed to interpret correctly the information obtained during an ultrasound Doppler examination. This paper describes the flow conditions at the leaking valve and limitations of the Doppler technique which become important in the case of valve regurgitation. The flow conditions can be described in the following terms: contraction of the flow, core flow dimensions, friction, and intrusion and width of the jet flow. Contraction occurs at the entrance to the orifice and causes the width of the jet at the orifice to be smaller than the orifice itself. This contraction should be taken into account when calculating volume flow. The jet reaches a minimal area at the vena contracta where the flow velocity is close to that expected from the Bernoulli equation. The area of the vena contracta relative to the area of the hole can vary between 0.6 and 1.0; the lowest value is seen at a sharp-edged orifice and the highest value, at a hole with an ideally rounded inlet. Friction has a marginal role on flow velocity at the vena contracta. The velocity at the vena contracta persists in a region called the core flow region. This region has a length of 4-8 hole diameters. The total jet intrusion and the width of the jet are related to both the flow velocity at the hole and the diameter of the hole.(ABSTRACT TRUNCATED AT 250 WORDS)

Place, publisher, year, edition, pages
1987. Vol. 8 Suppl C, 29-33 p.
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:liu:diva-116892DOI: 10.1093/eurheartj/8.suppl_C.29PubMedID: 2960526OAI: diva2:801412
Available from: 2015-04-09 Created: 2015-04-09 Last updated: 2015-04-20

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Wranne, BengtAsk, PerLoyd, Dan
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Clinical PhysiologyFaculty of Health SciencesDepartment of Clinical Physiology in LinköpingPhysiological MeasurementsThe Institute of TechnologyApplied Thermodynamics and Fluid Mechanics
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