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Related Experiment Video

Updated: Sep 17, 2025

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Continuous and Noninvasive Total Blood Hemoglobin Measurement Using Near-Infrared Reflectance Spectrometry.

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Summary

A new near-infrared reflectance spectroscopy (NIRS) algorithm accurately measures total hemoglobin (tHb) continuously and noninvasively in cardiac surgery patients, aiding transfusion decisions.

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Clinical Monitoring

Background:

  • Continuous total hemoglobin (tHb) monitoring is clinically valuable during surgery for transfusion guidance.
  • Existing pulse oximetry-based devices show variable accuracy.
  • A novel near-infrared reflectance spectroscopy (NIRS) algorithm offers noninvasive, continuous tHb measurement.

Purpose of the Study:

  • To evaluate the performance of a new NIRS-based algorithm for continuous tHb measurement.
  • To assess the accuracy of the NIRS algorithm in cardiac surgery patients.

Main Methods:

  • Retrospective analysis of data from 189 cardiac surgery patients across 3 clinical sites.
  • Comparison of continuous NIRS-derived tHb with blood gas tHb measurements.
  • Statistical analysis using Bland-Altman, MAE, RMSE, 4-quadrant concordance, and error-grid analysis.

Main Results:

  • Bias of 0.08 g/dL and precision of 1.01 g/dL for NIRS tHb.
  • Mean Absolute Error (MAE) of 0.79 g/dL and Root Mean Square Error (RMSE) of 1.12 g/dL.
  • 86.1% 4-quadrant concordance, with 84% of measurements in the clinically acceptable green zone of the error grid.

Conclusions:

  • The NIRS-based algorithm provides accurate tHb measurements in cardiac surgery.
  • This technology shows promise for guiding intraoperative transfusion practices.
  • Further research is needed to validate its use in diverse clinical settings.