Mechanism of Production of Midsystolic Click in a Prolapsed Mitral Valve
スポンサーリンク
概要
- 論文の詳細を見る
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).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.This coincidence was found when the click was shifted either by postural changes or inhalation of amyl nitrite.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.
- International Heart Journal刊行会の論文
著者
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WATANABE Satoru
Department of Biocybernetics, Niigata University
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Ebina Toshiaki
Department Of Anesthesiology University Of Hirosaki School Of Medicine
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Takamiya Makoto
Department Of Internal Medicine And Therapeutics Osaka University Graduate School Of Medicine
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Terasawa Yoshio
The Res. Inst. For Tbc.. Leprosy And Cancer Tohoku Univ
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Terasawa Yoshio
Department Of Internal Medicine Sendai Shakaihoken Hospital
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Tanaka Motonao
Department Of Cardiology The Cardiovascular Institute Hispital
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Meguro Taiichiro
Department Of Cardiology Sendai Kousei Hospital
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KONNO Kiyoshi
Department of Internal Medicine, 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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HIKICHI Hisaharu
Department of Internal Medicine, Sendai Kosei Hospital
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TAKEDA Hisanao
Department of Internal Medicine, Sendai Kosei Hospital
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KOSAKA Shigemi
Semine Prefectural Hospital
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Watanabe Satoru
Department Of Biocybernetics Niigata University
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Watanabe Satoru
Department Of Astronomy School Of Science The University Of Tokyo
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EBINA Toshiaki
Department of Internal Medicine, Sendai Kosei Hospital
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MEGURO Taiichiro
Department of Internal Medicine, Sendai Kosei Hospital
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TERASAWA Yoshio
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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