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Mechanism of the B-B'step Formation in M-Mode Echocardiography Tosiyuki Ishikawa 1 , Kazuo Kimura 1 , Hiroshi Yoshimura 1 , Yasuo Ohyama 1 , Kiminari Kobayashi 1 , Masao Ishii 1 , Hisao Ochiai 2 , Takashi Usui 2 , Masanobu Kashiwagi 2 1The Second Department of Internal Medicine, Yokohama City University School of Medicine 2Fujisawa City Hospital Keyword: 拡張期僧帽弁逆流(diastolic mitral regurgitation) , B-B'ステップ(B-B'step) , パルス・ドプラ心エコー図法(pulse Doppler echocardiography) pp.465-470
Published Date 1991/5/15
DOI https://doi.org/10.11477/mf.1404900276
  • Abstract
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 This study analized the mechanism involved in the B -B'step formation of the mitral valve movement using pulsed Doppler and color Doppler echocardiography. We examined 24 patients with first degree atrioventricular block (AVB), 26 with old myocardial infarction (OMI), and 34 with a DDD-pacemaker (PM) (16 with complete AV block and 18 with sick sinus syndrome). In 19 of 24 AVB patients, the B-B'step was associated with diastolic mitral regurgitation (DMR). There was a significant positive correlation between the magnitude of the PQ interval and the B-B'step duration (r=0.94, p<0.001).


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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