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  • Title: Does indocyanine green accurately measure plasma volume independently of its disappearance rate from plasma in critically ill patients?
    Author: Ishihara H, Iwakawa T, Hasegawa T, Muraoka M, Tsubo T, Matsuki A.
    Journal: Intensive Care Med; 1999 Nov; 25(11):1252-8. PubMed ID: 10654209.
    Abstract:
    OBJECTIVE: To determine whether plasma volume determined by the indocyanine green (ICG) dilution method (PV-ICG) is equally accurate independently of its disappearance rate from plasma in the critically ill. DESIGN: Retrospective clinical investigation. SETTING: Intensive care unit of a university teaching hospital. PATIENTS AND METHODS: 192 adult patients were initially enrolled. The PV-ICG and the initial distribution volume of glucose (IDVG) were calculated utilizing a one-compartment model by simultaneous administration of ICG 25 mg and glucose 5 g on the first day of measurement in each patient. Twenty-one patients were excluded from the study because of a higher PV-ICG/IDVG ratio (> 0.45) indicating apparent overestimation of the PV-ICG associated with the generalized protein capillary leakage. The remaining 171 patients were divided into four groups according to the magnitude of their disappearance rate of ICG from plasma (Ke-ICG). RESULTS: Convergence was assumed consistently in each ICG or glucose decay curve, even in the lower Ke-ICG less than 0.10/min. The relationship between the two volumes was not statistically different among groups. CONCLUSIONS: The results suggest that the measurement of the PV-ICG can be equally accurate independently of its disappearance rate from plasma unless there is generalized protein capillary leakage.
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