The Use of Fiberoptics in Clinical Cardiac Catheterization
نویسنده
چکیده
T HE instrument* and catheterst used in the fiberoptic oximeter described earlier' can also be applied to the colorimetric measurement of indicator substances such as Cardiogreen.+ With such a technic, momentto-moment changes in indicator concentration may be measured instead of the average concentration obtained with conventional instruments. Furthermore, no more sampling of blood is necessary than the small amount required for calibration of the injectate. The essential differences from the method described earlier for the determination of oxygen saturation,1 in which the ratio of reflected light intensities at 805/660 m,u is utilized, lies in the application of the ratio 910/805-myk wavelengths in the "high' speed instrument. While the reflected 805-m,u light intensity is inversely proportional to the concentration of indocyanine green, under constant flow and turbulence, 910-my light is unaffected by this indicator and therefore may serve as a reference intensity. This is necessary, since considerable fluctuation in the 805-m,u reflected light intensity is noted if the catheter is not in a continuously uniformly
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