Japanese journal of medical electronics and biological engineering
Online ISSN : 2185-5498
Print ISSN : 0021-3292
ISSN-L : 0021-3292
Simple Formulae for Calculation of Cardiac Output and Mean Transit Time from Dye Dilution Curve
Akira KAMIYATatsuo TOGAWAMasamitsu OSHIMA
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1968 Volume 6 Issue 3 Pages 224-231

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Abstract
In this paper A simple method for calculation of cardiac output and mean transit time from dye-dilution curve was investigated with the use of gamma distribution function
An approximation derived from the property of the function gave the following formulae :
cardiac output=_??_
mean transit time=Tp+1.1× (T2-T1) (sec)
Where, I : amount of dye injected, Cp : peak concentration, Tp : time of peak concentration, T1andT2 : forward and backward parts of half width, respectively.
The values calculated with these formulae were compared with those calculated with Hamilton's method for 51 recordings of 16 patients without arterio-venous shunting or regurgitation in the heart. The discrepancies of calculated cardiac outputs and mean transit times with the two methods were less than 2.1% and 3.2%, respectively.
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© Japanese Society for Medical and Biological Engineering
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