Adequacy in dialysis: intermittent versus continuous therapies

Area of Science:

• Nephrology
• Renal Replacement Therapy
• Dialysis Adequacy

Background:

• Dialysis adequacy targets, such as Kt/V urea, differ between intermittent and continuous therapies.
• Existing guidelines for dialysis adequacy are based on assumptions linking Kt/V urea to protein intake.
• The relationship between dialysis dose and patient survival is well-established for hemodialysis but less direct for peritoneal dialysis.

Purpose of the Study:

• To explore the complexities of dialysis dose prescription and its impact on patient outcomes.
• To highlight the need for further research in defining optimal dialysis strategies for diverse patient groups.
• To emphasize the importance of incremental dialysis and early initiation of therapy.

Main Methods:

• Review of existing literature and guidelines on dialysis adequacy.
• Discussion of urea kinetic modeling for predicting dialysis timing and dosage.
• Identification of gaps in current research, particularly regarding specific patient populations and continuous therapies.

Main Results:

• Optimal dialysis dose remains undefined despite data suggesting increased prescription improves survival.
• Methodological concerns exist in studies evaluating dialysis dose-outcome relationships.
• Prospective randomized trials, like the HEMO study, are crucial for clarifying these relationships.

Conclusions:

• Further research is imperative to define optimal dialysis doses for malnourished, diabetic, and pediatric patients.
• Prospective randomized trials are needed to validate the Risk/Dose function and linearity assumptions in dialysis.
• Comparisons between incremental hemodialysis and peritoneal dialysis are necessary to optimize technique survival and preserve residual renal function.