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ID 17147
Eprint ID
17147
FullText URL
Thumnail 89_713.pdf 1.97 MB
Title Alternative
Electrostatic transducer of apexcardiogram
Author
Ishii, Yoshihisa
Hirano, Kazuhiro
Kawai, Tatsuya
Saito, Daiji
Haraoka, Shoichi
Abstract
Apexcardiogram by mean of non-invasive method may be more usefull provided that the technique for the transducer attachment was easier and reprodusable. In this report, some attempts on the transducer of apexcardiogram were described. A precordial electrode was placed about 1.5 mm above the chest wall of a patient. The electrostatic capacitance between the electrode and chest wall was transmitted to the CR oscillator and it modulated the frequency of pulse train generated with the oscillator. The signals were led to a conventional D.C. recorder or a cathode ray oscilloscope. There was no remarkable differences of the wave pattern between the apexcardiogram obtained by our method and by conventional piezoelectric transducer in normal cases. In some patients, however, some differences were observed especially in the depth of O-wave. The depth of O-wave increased in accordance with a rise in pressure of the transducer to the chest wall using the conventional method. The observations suggest that the A/E-O ratio might be varied depending on attaching pressure of the transducer to the chest wall.
Published Date
1977-06-30
Publication Title
岡山医学会雑誌
Publication Title Alternative
Journal of Okayama Medical Association
Volume
volume89
Issue
issue5-6
Publisher
岡山医学会
Publisher Alternative
Okayama Medical Association
Start Page
713
End Page
720
ISSN
0030-1558
NCID
AN00032489
Content Type
Journal Article
Official Url
https://www.jstage.jst.go.jp/article/joma1947/89/5-6/89_5-6_713/_article/-char/ja/
Related Url
http://www.okayama-u.ac.jp/user/oma/index.html
language
日本語
Copyright Holders
岡山医学会
File Version
publisher
Refereed
True
Eprints Journal Name
joma