Modeling the Dose of Home Dialysis

Area of Science:

• Nephrology
• Renal Replacement Therapy
• Dialysis Dosing

Background:

• Growing interest in daily and combined dialysis treatments necessitates a versatile dosing model.
• Existing models aim to define continuous clearance equivalent to intermittent dialysis.
• These models focus on specific points in the blood urea nitrogen (BUN) profile.

Purpose of the Study:

• To review and evaluate three existing dialysis dosing models.
• To determine the most clinically relevant model for various dialysis frequencies and intensities.
• To assess the generalizability of these models with available outcome data.

Main Methods:

• Review of three continuous clearance dialysis dosing models: peak Kt/V (pkKt/V), standard Kt/V (stdKt/V), and equivalent renal clearance (EKRt/V).
• Evaluation of model clinical relevance using continuous ambulatory peritoneal dialysis (CAPD) outcome data.
• Application of the stdKt/V model to assess dialysis dose in two hemodialysis studies.

Main Results:

• The stdKt/V model predicts an optimal weekly dose of 2.0 for CAPD, while pkKt/V and EKRt/V predict 1.8 and 3.0, respectively.
• Hemodialysis studies using the stdKt/V model showed significant dose variation (2.0 vs. 5.6) despite similar dialysis frequency.
• These findings highlight the need for a generalized model to standardize dialysis dose assessment.

Conclusions:

• The stdKt/V model demonstrates the most realistic prediction for optimal CAPD outcomes.
• Current data suggest stdKt/V is a promising model, but further validation at higher therapy levels is required.
• A generalized dialysis dosing model is crucial for guiding and comparing studies, especially for daily home dialysis.