Estimating dialysis adequacy using ionic dialysance.

Area of Science:

• Nephrology
• Biomedical Engineering
• Clinical Chemistry

Background:

• Dialysis adequacy is crucial for patient outcomes.
• Current methods for assessing dialysis adequacy, like single pool Kt/V (spKt/V), are typically performed monthly.
• A need exists for more frequent and feasible methods to monitor dialysis effectiveness.

Purpose of the Study:

• To evaluate the efficacy and feasibility of using ionic dialysance (ID) to estimate dialysis adequacy.
• To compare dialysis adequacy estimations derived from ionic dialysance (K(ID)t/V(ID)) with traditional urea-based measurements (spKt/V).

Main Methods:

• Retrospective review of medical records for patients undergoing thrice-weekly dialysis.
• Monthly calculation of spKt/V using pre- and post-treatment blood urea nitrogen (BUN) levels.
• Simultaneous determination of K(ID)t/V(ID) using ionic dialysance measurements and estimated surrogate volume (V(ID)).

Main Results:

• K(ID)t/V(ID) estimations showed strong correlation with spKt/V (r = 0.95, p < 0.001), with a slope of 0.85.
• Average K(ID)t/V(ID) and spKt/V values were comparable across the study months (e.g., 1.55 vs. 1.59 and 1.52 vs. 1.54).
• While intra-patient variability was noted for K(ID)t/V(ID), its coefficient of variation was similar to that of spKt/V.

Conclusions:

• Ionic dialysance provides a feasible and effective method for estimating dialysis adequacy during each treatment session.
• The variability observed in K(ID)t/V(ID) suggests significant variations in delivered dialysis adequacy, potentially leading to sub-optimal treatments.
• Real-time monitoring with ID could enable timely adjustments to optimize dialysis delivery.