Impedance Changes durig the Electrical and Mechanical Activies of a Bullfrog Heart
書誌事項
- タイトル別名
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- Impedance Changes during the Electrical and Mechanical Activities of a Bullfrog Heart
- Impedance Changes durig the Electrical
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Electrical impedance of a bullfrog ventricle was recorded epicardially by the V-I method and the bridge method together with an electrocardiogram (ECG) and a contraction curve, in terms of shortening. Impedance change during one cardiac cycle of a contracting ventricle corresponded completely to the contraction curve in its time course: impedance decreased during systole and attained minimum at the peak of contraction, and the durations of both curves were almost identical. The ratio of impedance just before T-wave to that just after R-wave (|ZT|/|ZR|) of an in situ heart was increased when the ventricle contracted isovolumetrically by means of mineral oil: the ratio was far less than 1.0 in control ventricle, while it was more than 1.0 in oilfilled one (2/3 cases). Upon isometric condition or treatment of cadmium the motion restricted ventricle caused an increase in the impedance ratio (|ZT|/|ZR|) to higher than 1.0, as in the case of oil-filled ventricle. The epicardial recording of ventricular impedance seems to consist of two components: contraction (shortening)-dependent impedance change and contraction (shortening)-independent impedance change, which reflects the membrane activity. Vigorous contraction will probably mask the latter and reveal only the former.
収録刊行物
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- The Japanese Journal of Physiology
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The Japanese Journal of Physiology 29 (3), 251-265, 1979
一般社団法人 日本生理学会
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詳細情報 詳細情報について
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- CRID
- 1390001205042044416
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- NII論文ID
- 130003476724
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- NII書誌ID
- AA00691224
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- COI
- 1:STN:280:DyaL3c%2Flt1Gkug%3D%3D
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- ISSN
- 18811396
- 0021521X
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- NDL書誌ID
- 2077521
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- PubMed
- 315487
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可