Related Experiment Video
Updated: Jul 8, 2025
Use of Enzymatic Biosensors to Quantify Endogenous ATP or H2O2 in the Kidney
Published on: October 12, 2015
Optical Real-Time Cardiorenal Toxin Uric Acid Measurement During Hemodialysis Using a Miniaturized Optical Sensor
Insights
A new optical sensor reliably monitors uric acid removal during hemodialysis, a key toxin in chronic kidney disease (CKD) patients. This technology aids in managing cardiovascular risk in CKD patients undergoing dialysis treatments.
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.
Abstract:
Patients with chronic kidney disease (CKD) are at higher cardiovascular risk than the general population. Cardiovascular diseases, vascular calcification among them, are the leading cause of death in these patients. Factors influencing vascular calcification are oxidative stress, inflammation, and accumulation of uremic toxins during CKD. Uric acid is a cardiorenal toxin that accumulates in the case of kidney malfunction. The primary therapy for replacing kidney function and removing toxins from end-stage renal disease patients is hemodialysis. Effective removal of toxins can be estimated by blood or dialysate lab analysis or optical monitoring. In this study, the authors tested a miniaturized optical sensor for monitoring uric acid levels and removal for the first time in a more extensive clinical study, including Hemodialysis (HD) and Post-dilutional online hemodiafiltration (HDF) procedures with different settings in Tallinn, Estonia. The results (Mean±SD, Lab vs. Sensor) of the uric acid concentration 57.20±34.05 vs. 57.22±33.09 µmol/L, reduction ratio 68.72±10.91 vs. 67.89±12.48 %, and total removed amount 7.00±2.10 vs. 7.33±2.29 mmol did not differ significantly from the values obtained from the clinical laboratory (p<0.05).Clinical Relevance-During this study, a miniaturized optical sensor was tested for the first time in the clinic in different dialysis settings. The results confirm that the sensor is reliable for regularly monitoring cardiorenal toxin uric acid removal during hemodialysis.
