Measurement of coronary circulation time with a catheter type micro G-M counter.

نویسندگان

  • H Ueda
  • T Koide
  • M Iio
  • A Nakanishi
  • I Ito
چکیده

Coronary circulation time was measured in 17 dogs using a micro G-M counter attached to the tip of catheter and a radioactivity recording circuit with minimal time delay. P32-orthophosphate sodium solution was injected instantaneously into the left ventricle and its arrival into the right side of the heart was monitored in situ with the G-M counter. A biphasic curve was recorded in the right ventricle, of which the earlier peak was indebted to coronary circulation, and the later one to systemic. The early peak was inscribed also in the right atrium and coronary sinus, but in neither the superior nor the inferior vena cava. The average coronary circulation time from the left ventricle to the right ventricle was 2.2•}1.0 (S.D.) sec., ranging from 0.9 to 3.8 sec. in 9 dogs, when measured as the transit time of peak radioactivity. The value thus obtained was appreciably shorter than those reported previously by others. Since one of the probable reasons of this discrepancy was the inadequate accuracy of conventional methods, the superiority of our technic was discussed briefly.

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عنوان ژورنال:
  • Japanese heart journal

دوره 6 6  شماره 

صفحات  -

تاریخ انتشار 1965