Optical Real-Time Cardiorenal Toxin Uric Acid Measurement During Hemodialysis Using a Miniaturized Optical Sensor.

Area of Science:

• Nephrology
• Biomedical Engineering
• Cardiovascular Medicine

Background:

• Patients with chronic kidney disease (CKD) face elevated cardiovascular disease (CVD) risk, with vascular calcification being a primary cause of mortality.
• Uric acid, a cardiorenal toxin, accumulates in CKD, contributing to vascular calcification and CVD.
• Hemodialysis is the standard treatment for end-stage renal disease (ESRD) to remove toxins, but effective monitoring of toxin removal is crucial.

Purpose of the Study:

• To evaluate the efficacy of a miniaturized optical sensor for real-time monitoring of uric acid levels and its removal during hemodialysis.
• To compare the sensor's performance against traditional clinical laboratory analysis in diverse dialysis settings.

Main Methods:

• A miniaturized optical sensor was deployed in a clinical study involving Hemodialysis (HD) and Post-dilutional online hemodiafiltration (HDF).
• Uric acid concentrations, reduction ratios, and total removed amounts were measured using both the optical sensor and a clinical laboratory.
• Data were analyzed to compare the sensor's readings with established laboratory values.

Main Results:

• The optical sensor demonstrated comparable results to the clinical laboratory for uric acid concentration (57.22±33.09 vs. 57.20±34.05 µmol/L).
• Uric acid reduction ratios (67.89±12.48 % vs. 67.72±10.91 %) and total removed amounts (7.33±2.29 vs. 7.00±2.10 mmol) showed no significant difference between the sensor and lab methods (p<0.05).

Conclusions:

• The miniaturized optical sensor is a reliable tool for monitoring cardiorenal toxin uric acid removal during hemodialysis.
• This technology offers potential for regular, real-time assessment of dialysis efficiency and patient cardiovascular risk management.