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Detection of left ventricle dysfunction from shape deformity
J. Manivannan,
Published in Australasian Coll. of Phys. Scientists and Engineers
2005
PMID: 15920990
Volume: 28
   
Issue: 1
Pages: 51 - 55
Abstract

Coronary artery disease producing ischemic cardiomyopathy is the most frequent cause of left ventricular systolic dysfunction. Non-ischemic cardiomyopathies can also produce systolic dysfunction; they may be inherited as genetic disorders or occur sporadically. These coronary injuries have repercussions on the left ventricle producing changes on wall contractility, the shape of the cavity and also changes on ventricular function. This study is focused on the 2D echocardiograms of the left ventricle. Apical two chamber and four chamber view recordings were performed on normal and systolic dysfunction subjects. Individual frames were extracted for at least five cardiac cycles. After pre-processing these images, segmentation of the left ventricle was performed by Fuzzy systems. Then the volumes were measured by single and biplane methods along with the perimeter, short axis length and long axis length in each frame, from which the two indices Sphericity Index (SI) and Normalized Eccentricity Index (NEI) was determined. It was found that the diastolic phase is short in the case of systolic dysfunction, and its volume variation is not uniform as in the normal case. Also, in the case of systolic dysfunction, the span of either the long or short axis length variation is less than 0.5 cm. This depicts that akinesis is in the corresponding direction; the value of SI is less than 2 for systolic dysfunction. A sharp peak is seen at each systole point in the NEI plot and also its variation is smooth in subjects having LVEF > 45%, which is not the case for dysfunction. Copyright © 2005 ACPSEM/EA.

About the journal
JournalAustralasian Physical and Engineering Sciences in Medicine
PublisherAustralasian Coll. of Phys. Scientists and Engineers
ISSN01589938
Open AccessNo
Concepts (19)
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    Curve fitting
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    Functions
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    Fuzzy sets
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    Genetic engineering
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    ECHOCARDIOGRAMS
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    NORMALIZED ECCENTRICITY INDEX (NEI)
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    SPHERICITY INDEX (SI)
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    SYSTOLIC DYSFUNCTION
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    Cardiology
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    AKINESIA
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    Article
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    Controlled study
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    Echocardiography
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    HEART CYCLE
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    HEART LEFT VENTRICLE CONTRACTILITY
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    HEART LEFT VENTRICLE EJECTION FRACTION
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    HEART LEFT VENTRICLE FUNCTION
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    HEART LEFT VENTRICLE PERFORMANCE
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    Human