Comparison of dialysis dose through real-time Kt/V by ultraviolet absorbance of spent dialysate, single-pool Daugirdas II, and Kt/BSA according to sex and age

Background: Kt/V OnLine (Kt/VOL) avoids inaccuracies associated with the estimation of urea volume distribution (V). The study aimed to compare Kt/ VOL, Kt/V Daugirdas II, and Kt/BSA according to sex and age. Methods: Urea volume distribution and body surface area were obtained by Watson and Haycock formulas in 47 patients. V/ BSA was considered as a conversion factor from Kt/ V to Kt/BSA. Dry weight was determined before the study. Kt/VOL was obtained on DIALOG machines. Results: Pearson correlation between Kt/VOL vs Kt/VII and Kt/VOL vs Kt/BSA was significant for males (r = 0.446, P = 0.012 and r = -0.476 P = 0.007) and individuals < 65 years (0.457, P = 0.019 and -0.549 P = 0.004), but not for females and individuals >= 65 years. V/BSA between individuals < 65 and individuals >= 65 years were 18.28 +/- 0.15 and 18.18 +/- 0.16 P = 0.000). No agreement between Kt/VII vs Kt/BSA. Men and individuals > 65 years received a larger dialysis dose than, respectively, females and individuals < 65 years, in the comparison between Kt/VOL versus Kt/VII. V/BSA ratios among men and women were respectively 18.29 +/- 0.13 and 18.12 +/- 0.15 P = 0.000. Conclusions: Kt/ VOL allows recognition of real-time dose regardless of sex and age.