Real-Time Dialysis Dose: Ionic Dialysis Versus Classical Urea Kinetic Modeling Indices

Area of Science:

• Nephrology
• Renal Replacement Therapy
• Dialysis Monitoring

Background:

• Hemodialysis is crucial for over 80% of the 850 million people requiring renal replacement therapy globally.
• Traditional dialysis adequacy metrics like spKt/V and URR are measured infrequently (1-3 months) and don't capture real-time dialysis delivery.
• Current methods lack continuous monitoring, hindering timely therapeutic adjustments and potentially impacting patient outcomes.

Purpose of the Study:

• To introduce ionic dialysis as a novel, real-time method for assessing hemodialysis adequacy.
• To evaluate the comparability and reliability of ionic dialysis against classical urea kinetic modeling (UKM).
• To identify potential sources of error and assess the clinical utility of ionic dialysis.

Main Methods:

• A retrospective study involving 32 hemodialysis patients over one year (Jan-Dec 2020).
• Ionic dialysis (online clearance monitor) and UKM were used to measure dialysis dose four times per patient (quarterly).
• Comparison of delivered dialysis dose measurements between the two methods, including correlation analysis and regression modeling.

Main Results:

• A high correlation was observed between ionic dialysis (onKt/V) and traditional adequacy indicators (spKt/V, URR).
• Significant differences were noted, primarily attributed to anthropometric formulas used in UKM for volume estimation.
• Regression models confirmed the high predictive value of ionic dialysis for the delivered dialysis dose.

Conclusions:

• Online clearance monitoring (OCM) via ionic dialysis is a practical, non-invasive tool for daily use in hemodialysis.
• OCM complements traditional methods, enabling adequate dialysis dose delivery with increased patient benefit.
• Ionic dialysis offers a minimal cost alternative for continuous monitoring, facilitating timely therapeutic interventions.