Computer Simulations of Continuous Flow Peritoneal Dialysis Using the 3-Pore Model-A First Experience

Area of Science:

• Nephrology
• Biomedical Engineering
• Computational Physiology

Background:

• Continuous flow peritoneal dialysis (CFPD) utilizes dual-lumen catheters for higher dialysate flow rates (DFR).
• While CFPD shows improved clearances, predicting ultrafiltration (UF) to prevent overfill remains a challenge.
• This study investigates CFPD using an extended 3-pore model for in silico physiological analysis.

Purpose of the Study:

• To simulate and evaluate the efficacy of CFPD in enhancing solute and water clearance.
• To assess the impact of varying DFR and glucose concentrations on clearance and UF.
• To develop and test strategies for preventing fluid overfill during CFPD.

Main Methods:

• Simulated a 9-hour CFPD session across slow, average, and fast peritoneal transporters.
• Utilized 1.36%, 2.27%, and 3.86% glucose solutions.
• Applied a mass-balance equation to predict and manage UF rates, testing intermittent-continuous regimes.

Main Results:

• Increased DFR significantly improved small- and middle-molecule clearances (2-5x higher than CAPD).
• Achieved UF rates exceeding 10 mL/min for all transport types.
• β2-microglobulin clearance showed strong dependence on UF rate and DFR, increasing by 60-130%.

Conclusions:

• CFPD demonstrates substantial increases in solute and water clearance.
• Intermittent-continuous regimes show promise in preventing overfill for lower glucose concentrations.
• In silico findings require in vivo validation to confirm clinical applicability.