Mechanism of Production of Midsystolic Click in a Prolapsed Mitral Valve
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- TERASAWA Yoshio
- Department of Internal Medicine, the Research Institute for Tuberculosis and Cancer, Tohoku University
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- TANAKA Motonao
- Department of Internal Medicine, the Research Institute for Tuberculosis and Cancer, Tohoku University
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- KONNO Kiyoshi
- Department of Internal Medicine, the Research Institute for Tuberculosis and Cancer, Tohoku University
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- NIITA Keiko
- Department of Internal Medicine, Sendai Kosei Hospital
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- KASHIWAGI Makoto
- Department of Internal Medicine, Sendai Kosei Hospital
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- MEGURO Taiichiro
- Department of Internal Medicine, Sendai Kosei Hospital
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- HIKICHI Hisaharu
- Department of Internal Medicine, Sendai Kosei Hospital
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- WATANABE Satoru
- Department of Internal Medicine, Sendai Kosei Hospital
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- TAKEDA Hisanao
- Department of Internal Medicine, Sendai Kosei Hospital
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- EBINA Toshiaki
- Department of Internal Medicine, Sendai Kosei Hospital
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- KOSAKA Shigemi
- Semine Prefectural Hospital
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- TAKAMIYA Makoto
- Department of Radiology, Yamagata University, School of Medicine
書誌事項
- タイトル別名
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- Mechanism of Production of Midsystolic
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抄録
In order to examine the production mechanism of the midsystolic click in cases of a midsystolic click and a late systolic murmur, the relationship between the click and the motion of the mitral apparatus was studied by means of ultrasono-cardiotomography and the simultaneous recording of phonocardiograms and ultrasono-cardiograms (UCGs).<br>It was found that the systolic click occurred in exact coincidence with the time at which the hump of the echo of the unusual early systolic anterior motion (early SAM) took its backmost position.<br>This coincidence was found when the click was shifted either by postural changes or inhalation of amyl nitrite.<br>The present ultrasono-cardiotomographic study demonstrated that the echo source of the early SAM could be attributed to the protrusion into the left ventricular outflow tract of the slackened elongated chordae tendineae in systole. The anterior leaflet moved suddenly to the position of maximal prolapse when the slackened chordae tendineae were stretched taut in midsystole. In other words, the midsystolic click occurred when the anterior leaflet prolapsed and the tension exerted on the chordae tendineae was at its maximum.
収録刊行物
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- Japanese Heart Journal
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Japanese Heart Journal 18 (5), 652-663, 1977
International Heart Journal刊行会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390001205038209664
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- NII論文ID
- 130000762873
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- NII書誌ID
- AA00690786
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- ISSN
- 1348673X
- 00214868
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- NDL書誌ID
- 1912909
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- PubMed
- 926311
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可