Comparison of methods to predict equilibrated Kt/V in the HEMO Pilot Study

Area of Science:

• Nephrology
• Renal Replacement Therapy
• Clinical Trials

Background:

• The HEMO Study investigates dialysis dosage effects on patient outcomes.
• Accurate quantification of hemodialysis dose (eKt/V) is crucial for clinical trials.
• The MMHD Pilot Study aimed to assess the reliability of various eKt/V measurement methods.

Purpose of the Study:

• To evaluate the feasibility of achieving target hemodialysis doses (eKt/V) of 1.0 and 1.4.
• To compare the accuracy of different methods for calculating eKt/V, including those that avoid post-dialysis blood sampling.
• To determine the reliability of blood-based and dialysate-based kinetic modeling techniques.

Main Methods:

• Compared standard eKt/V calculation (predialysis, postdialysis, and 30-min postdialysis BUN) with four alternative methods.
• Evaluated a rate method using a linear equation based on solute removal rate (K/V).
• Assessed intradialysis methods and a dialysate-side method (BioStat) for eKt/V approximation.

Main Results:

• Demonstrated feasibility of achieving eKt/V targets of 1.0 and 1.4, with mean values of 1.14 and 1.52 respectively.
• Alternative blood-side methods showed good correlation with the standard method (r=0.76-0.85).
• The rate method provided the best accuracy, with the smallest median absolute difference in eKt/V.

Conclusions:

• The rate method, using pre- and post-dialysis samples, offers a reasonably accurate prediction of equilibrated Kt/V.
• Intradialytic sampling does not significantly increase the accuracy of eKt/V prediction for most patients.
• Dialysate urea analysis provides eKt/V results comparable to blood-based kinetic modeling.