Measurement of Coronary Circulation Time with a Catheter Type Micro G-M Counter
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概要
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Coronary circulation time was measured in 17 closed-chest dogs. Meas-urement was made by injecting P32 into the left ventricle, and detecting its arrival into the right ventricle with a catheter type micro G-M counter in situ. This technic was devised to exclude sources of significant error inherent to conventional dye dilution technic.Average coronary circulation time in dogs was 2.2 (0.9-3.8) sec., and was significantly shorter than that reported in published works. Appearance of P32 in the superior and inferior vena cava through systemic circulation took 5.0 and 4.6 sec. on average, respectively, occurring appreciably later than that in the right ventricle through coronary circuit. The "coronary" dilution curve, however, could not be separated from "systemic" one in the right ventricle.Discussion was also made about characteristics of the micro G-M counter, and it was suggested to be useful for in vivo measurement of radioisotopes in various ways.
- International Heart Journal刊行会の論文
著者
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Nakanishi Atsuo
Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo:dokkyo Medical Colleg
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IIO Masahiro
Second Department of Internal Medicine, Faculty of Medicine, University of Tokyo
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Ueda Hideo
Second Department Of Internal Medicine Faculty Of Medicine University Of Tokyo
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KOIDE Tadashi
Second Department of Internal Medicine, Faculty of Medicine University of Tokyo
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ITO Iwao
Second Department of Internal Medicine and the Department of Thoracic Surgery, Faculty of Medicine, University of Tokyo
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