Intensity distribution of the systolic murmer in ventricular septal defect on the chest surface

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  • OGAWA Toshimasa
    First Department of Internal Medicine, Nagoya University School of Medicine
  • TAKADA Hideo
    First Department of Internal Medicine, Nagoya University School of Medicine
  • YOSHIDA Shinji
    First Department of Internal Medicine, Nagoya University School of Medicine
  • HISADA Sumio
    First Department of Internal Medicine, Nagoya University School of Medicine
  • HORIKOSHI Kazuo
    First Department of Internal Medicine, Nagoya University School of Medicine
  • HOTTA Shuji
    First Department of Internal Medicine, Nagoya University School of Medicine
  • NAGAYA Teruo
    First Department of Internal Medicine, Nagoya University School of Medicine
  • MIZUNO Yasushi
    First Department of Internal Medicine, Nagoya University School of Medicine
  • HIBINO Susumu
    First Department of Internal Medicine, Nagoya University School of Medicine

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  • Intensity Distribution of the Systolic Murmur in Ventricular Septal Defect on the Chest Surface

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The intensity distribution of systolic murmur on chest surface was examined on 7 patients with ventricular septal defect. The frequencies of 79, 100, 200, 400 and 800cps were investigated. On the chest surface the equal intensity contour lines of the systolic murmur in ventricular septal defect were of approximately concentric circles centering around the point of maximum intensity of the murmur for each frequency.<br>On the frequencies of 79, 100, 200 and 400cps, the relationships between the relative intensity in decibels of the murmur and the distance from the point of maximum intensity of the murmur were inversely proportional. Andthe apparent dampings per cm. of distance were from 0.4 to 1.8dB/cm. for 100cps, 0.4 to 2.0dB/cm. for 200cps and from 0.7 to 3.3 dB/cm. for 400cps. On the frequency of 800cps, the apparent damping become smaller according as the distance from the point of maximum intensity increased, in 4 of 7 cases. The apparent viscous damping obtained from the present data was generally smaller than the viscous damping of the sound during the transmission over chest surface.

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