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Japanese

Experimental study of the genesis of the third heart sound Yukio Ozawa 1 , Masaki Nagasawa 1 , Naoshi Tanigawa 1 , Ryusukc Kozima 1 , Tomoaki Saito 1 , Satoshi Saito 1 , Michinobu Hatano 1 1Second Department of Medicine, Nihon University, School of Medicine pp.401-407
Published Date 1984/4/15
DOI https://doi.org/10.11477/mf.1404204431
  • Abstract
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We studied 9 open chest anesthetized dogs in which a third heart sound (S3) was found on epi-cardium at the left ventricular apex, or repeatedly induced by hypoxemia due to stopping the ven-tilator. In all dogs, miniature accelerometers were applied on epicardium at apex and over left ven-tricular anterolateral wall. Ultrasonic dimension gauges were placed in the subendocardium at samelocations. Recordings were made at apex and anterolateral wall of : surface velocity and acceler-ation, and S3 phono, as well as the velocity and ac-celeration of myocardial length changes.

Results : There was an excellent correlation of peak surface velocity (derived from the accelerome-ter signal) and the peak velocity of myocardial length change (r=0.94). These parameters increas-ed in parallel fashion during S3 production induced by oxgen deprivation. The beginning of S3 was synchronous with the onset of negative jerk of the LV surface motion and myocardial length changes at the cardiac apex. Analogous movements at the anterolateral area preceded S3. We conclude that S3 results from a sudden intrinsic limitation of LV wall expansion at the cardiac apex.


Copyright © 1984, 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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