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Updated: Sep 15, 2025
04:36
Measurement of Tissue Oxygenation Using Near-Infrared Spectroscopy in Patients Undergoing Hemodialysis
Published on: October 2, 2020
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Exploring Lung Fluid Dynamics in Haemodialysis With Remote Dielectric Sensing.
Wen-Hsin Wen1, Yi-Ju Tsai2,3, Fan-Chi Chang4
1Department of Anesthesiology, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan.
Nephrology (Carlton, Vic.)
|July 15, 2025
Summary
Remote dielectric sensing (ReDS) effectively detects persistent pulmonary congestion in haemodialysis patients, even after fluid removal. This non-invasive tool aids in managing fluid overload, crucial for improving patient outcomes and reducing cardiac events.
Area of Science:
- Nephrology
- Cardiology
- Biomedical Engineering
Background:
- Pulmonary congestion is a frequent and serious complication in haemodialysis patients, linked to increased cardiac events and mortality.
- Current methods for assessing fluid status in these patients lack precision, necessitating advanced diagnostic tools.
- Remote dielectric sensing (ReDS) offers a non-invasive, rapid, and quantitative approach to measure lung fluid accumulation.
Purpose of the Study:
- To evaluate the efficacy of ReDS in detecting and quantifying pulmonary congestion in patients undergoing chronic maintenance haemodialysis.
- To assess the prevalence of pulmonary congestion before and after haemodialysis sessions using ReDS.
- To explore the relationship between ReDS measurements, ultrafiltration volumes, and intradialytic hypotension.
Main Methods:
- A prospective cross-sectional study involving 58 haemodialysis patients between March and June 2022.
- ReDS measurements were taken immediately before and after haemodialysis sessions to identify pulmonary congestion (ReDS > 35%).
- Analysis included ultrafiltration volumes, incidence of intradialytic hypotension, and associated risk factors.
Main Results:
- 48% of patients had pulmonary congestion pre-haemodialysis, and 33% remained congested post-haemodialysis, indicating persistent fluid overload.
- Ultrafiltration volumes showed a weak correlation with ReDS changes (r=0.309, p=0.018).
- ReDS measurements did not predict intradialytic hypotension, which occurred in 21% of patients.
Conclusions:
- ReDS is a valuable tool for assessing pulmonary congestion in haemodialysis patients, identifying fluid overload both pre- and post-dialysis.
- Pulmonary congestion frequently persists even after achieving "dry weight," underscoring the need for refined fluid management strategies.
- Further longitudinal studies are required to confirm the prognostic value of ReDS and optimize its clinical application in haemodialysis care.
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