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- W2045646375 abstract "Objective Bedside monitoring of circulating blood volume has become possible with the introduction of an integrated fiberoptic monitoring system that calculates blood volume from the changes in blood concentration of indocyanine green dye 4 mins after injection. The aim of this investigation was to compare the blood volume estimate of the integrated fiberoptic monitoring system (group 1) with the standard methods of blood volume measurement using Evans blue (group 2), and indocyanine green measured photometrically (group 3). Design Prospective laboratory study. Setting Animal laboratory of a University's institute for experimental surgery. Subjects Eleven anesthetized, paralyzed, and mechanically ventilated piglets. Interventions A central venous catheter was used for the injection of the indicator dyes (Evans blue and indocyanine green). A fiberoptic thermistor catheter was advanced into the thoracic aorta. The fiberoptic catheter detects indocyanine green by reflection densitometry for the estimation of blood volume of the integrated fiberoptic monitoring system. Samples for the determination of Evans blue and indocyanine green concentrations were drawn from an arterial catheter in the femoral artery over a period of 17 mins after injection. Measurements and Main Results Measurements were performed during normovolemia, hypovolemia (blood withdrawal of <or=to30 mL/kg), and hypervolemia (retransfusion of the withdrawn blood plus an infusion of 10% hydroxyethyl starch [45 mL/kg]). Linear regression, correlation, and bias were calculated for the comparison of the blood volume estimates by the fiberoptic monitoring system (group 1) vs. the total blood volume estimates using Evans blue (group 2) and indocyanine green (group 3): group 1 = 0.82 centered dot group 2 - 26 mL; r2 = 82.71%; r = .91; n = 40; group 1 - group 2 +/- 1 SD = -435 +/- 368 mL; group 1 = 0.79 centered dot group 3 + 50 mL; r2 = 74.81%; r = .87; n = 28; group 1 - group 3 +/- 1 SD = -506 +/- 374 mL. Conclusions The results demonstrate that the blood volume estimate of the fiberoptic monitoring system (group 1) correlates closely with the total blood volume measurement using Evans blue (group 2) and indocyanine green (group 3). Trapped indicator in the packed red cell column after centrifugation of the blood samples may account for an overestimation of group 2 and group 3 of approximate 10% to 14%, but there still remains a proportional difference of 10% between group 1 vs. group 2 and vs. group 3. This difference is due to the longer mixing times of group 3 (16 mins) and group 2 (17 mins), during which they are distributed in slowly exchanging blood pools. It seems that the blood volume estimate of the fiberoptic monitoring system (group 1) represents the actively circulating blood volume and may be useful for bedside monitoring. (Crit Care Med 1995; 23:885-893)" @default.
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- W2045646375 title "Accuracy and reproducibility of the measurement of actively circulating blood volume with an integrated fiberoptic monitoring system" @default.
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- W2045646375 doi "https://doi.org/10.1097/00003246-199505000-00017" @default.
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