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Paper Abstract and Keywords
Presentation 2008-01-28 14:45
Imaging of Propagation of Electric Excitation and Shear Waves in Human Heart
Hiroshi Kanai (Tohoku Univ.) US2007-92
Abstract (in Japanese) (See Japanese page) 
(in English) We have already shown that the pulsive vibration is excited on the myocardium 15 ms after the electrical stimulation to an isolated heart. If the heart wall vibration caused by spontaneous electric excitation is visualized using ultrasound, the regional cell damage regarding electric potential due to diseases can be noninvasively detected. In this study, the spatial distribution of the minute vibration caused just around R-wave of ECG is visualized in in vivo experiments as follows: By the ultrasonic measurement of the myocardial motion, we detect pulsive waves spontaneously caused by electrical excitation or valve closure. Using a sparse sector scan, the waves are measured almost simultaneously at several thousand points set in the heart wall at a high frame rate (400 Hz). The consecutive spatial distributions of the interpolated phase of the waves reveal wave propagation along the wall. The propagation time is several ms, which is too short to be detected by conventional methods. The spontaneously driven pulsive waves and their propagations were clearly visible in 5 healthy subjects in the longitudinal-axis, short-axis, and apical views. Just after the Q-wave of ECG, the propagation started from the apex to the base side of the heart. Its propagation speed was slow (1-2 m/s for 20-100 Hz), which shows the propagation of electrical excitation. Then, after R-wave of ECG, another pulsive wave started to propagate reversely from base to apex. Since its speed was several m/s for about 50 Hz but there was dispersion, this is the shear wave caused by the mitral-valve closure. The method noninvasively reveals the propagation of electrical conduction wave by measuring regional myocardial response to it in human heart, which will be a novel tissue characterization of the heart.
Keyword (in Japanese) (See Japanese page) 
(in English) electric excitation / pulsive waves / heart sounds / phased tracking method / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 467, US2007-92, pp. 19-24, Jan. 2008.
Paper # US2007-92 
Date of Issue 2008-01-21 (US) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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reproduction
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee EA US  
Conference Date 2008-01-28 - 2008-01-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Kansai University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To US 
Conference Code 2008-01-EA-US 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Imaging of Propagation of Electric Excitation and Shear Waves in Human Heart 
Sub Title (in English)  
Keyword(1) electric excitation  
Keyword(2) pulsive waves  
Keyword(3) heart sounds  
Keyword(4) phased tracking method  
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1st Author's Name Hiroshi Kanai  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2008-01-28 14:45:00 
Presentation Time 30 minutes 
Registration for US 
Paper # US2007-92 
Volume (vol) vol.107 
Number (no) no.467 
Page pp.19-24 
#Pages
Date of Issue 2008-01-21 (US) 


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