An Experimental Study on the Phonocardiogram in Dogs

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  • 犬の心音図に関する実験的研究
  • イヌ ノ シンオンズ ニ カンスル ジッケンテキ ケンキュウ エイブン

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Abstract

The components of the central vibrations of the first heart sound on thephonocardiogram were studied in dogs. The results obtained are summarized as follows.1. Althottgh a clear time difference was found between Line left and right isometriccontraction pltases at the beginning, no time difference in the occurrence time was clearbetween the left and right central vibrations of the first lacart sotund on the externalphonocardiogram.2. The appearance of the ceuatral vibrations of the first he;rrt sound on the epicardialphonocardiogram was derived from the difference in the onset between the right and leftisometric contraction phase. The central vibrations of the first heart sound occurredtusually earlier on the left epicardial phonocardiogram Chart on the right cpicardialphonocardiogram.3. The central vibrations of the first heart sound on the cpicardial phonaocardiogramwere the closing sounds of the atrioventricular valves. The cetttral vibrations of the firstright epicarclial sound were originated from the tricuspid valx e component and those ofthe first left epicardial sound from the mitral valve component mainly.+. These results indicated that the central vibration of the first heart sound on thephonocardiogram in dogs were divided into two components. The mitral valve componentoccupied the first half of the central vibrations of the first l?eart sound, and a mixtureof mitral and tricuspid valve components the second half.

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