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Background: In a previous study, fluid kinetic models were applied to describe the volume expansion of the fluid spaceby administration of crystalloid and colloid solutions. However, validation of the models were not performed, it is necessaryto evaluate the predictive performance of these models in another population. Methods: Ninety five consenting patients undergoing elective spinal surgery under general anesthesia were enrolled inthis study. These patients were randomly assigned to three fluid groups i.e. Hartmann’s solution (H group, n = 28), VoluvenⓇ (V group, n = 34), and HextendⓇ (X group, n = 33). After completion of their preparation for surgery, the patientsreceived a loading and maintenance volume of each fluid predetermined by nomograms based on fluid pharmacokineticmodels during the 60-minute use of an infusion pump. Arterial samples were obtained at preset intervals of 0, 10, 20, and30 min after fluid administration. The predictive performances of the fluid kinetic modes were evaluated using the fractionalchange of arterial hemoglobin. The relationship between blood-volume dilution and target dilution of body fluidspace was also evaluated using regression analysis. Results: A total of 194 hemoglobin measurements were used. The bias and inaccuracy of these models were -2.69 and35.62 for the H group, -1.53 and 43.21 for the V group, and 9.05 and 41.82 for the X group, respectively. The bloodvolumedilution and target dilution of body-fluid space showed a significant linear relationship in each group (P < 0.05). Conclusions: Based on the inaccuracy of predictive performance, the fluid-kinetic model for Hartmann’s solutionshowed better performance than the other models.

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