<原著>非侵襲的心拍出量測定法の検討

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In order to validate the non-invasive measurement of cardiac output, the following 3 methods were compared with the standard cuvette dye method (CD). 1) The earpiece dye-dilution method (ED) : Cardiac output was measured by a Nihonkoden MLC-4100 which had two-color systems (805 and 900nm) and an automatic dye calibration device. 2) Echocardiography (UCG) : An Aloka SSD-90 ultrasonoscope with a 10mm diameter, 2.25 MHz non-focused transducer was used. Left ventricular volume was calculated by Pombo's method and Gibson's correction. 3) Impedance cardiography (IMP) : Cardiac output was calculated by Kubicek's formula using an IFM Minnesota impedance cardiograph MDL-304A. The cuvette dye curves were recorded by a Waters densitomer DCR-702. Results : 1) Cardiac outputs by ED significantly correlated with CD (r=0.91,y=0.96x+0.34). 2) UCG was also significantly correlated with CD in patients without regurgitation and shunt ; r=0.88,y=1.22x-0.19 for Pombo's method and r=0.90,y=1.23x-1.06 for Gibson's method, respectively. 3) IMP was less closely correlated with CD than ED or UCG : r=0.87,y=0.72x+1.66. IMP tended to show relatively low values in patients with low cardiac output. Thus, it is concluded that ED is the most reliable and useful one for clinical measurement of cardiac output. UCG is also comparable to ED except for the presence of the cases with difficult identification of the endocardium on echogram. IMP method would be useful for checking only the relative values of cardiac output.
1976-11-30

<原著>非侵襲的心拍出量測定法の検討

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