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Related Experiment Video

Updated: Nov 9, 2025

Non-Invasive Monitoring of Microvascular Oxygenation and Reactive Hyperemia using Hybrid, Near-Infrared Diffuse Optical Spectroscopy for Critical Care
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Bedside hyperspectral imaging indicates a microcirculatory sepsis pattern - an observational study.

M Dietrich1, S Marx1, M von der Forst1

  • 1Department of Anesthesiology, Heidelberg University Hospital, Heidelberg, Germany.

Microvascular Research
|April 8, 2021
PubMed
Summary
This summary is machine-generated.

Hyperspectral imaging (HSI) reveals distinct microcirculatory changes in sepsis, showing reduced oxygenation and perfusion. HSI may aid in risk stratification and edema evaluation for critically ill patients.

Keywords:
Critical careHyperspectral imagingMicrocirculatory monitoringSepsisTissue oxygenationTissue water content

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Area of Science:

  • Biomedical Engineering
  • Critical Care Medicine
  • Medical Imaging

Background:

  • Sepsis pathophysiology involves microcirculatory alterations, leading to tissue hypoxia and organ dysfunction.
  • Hyperspectral imaging (HSI) is an emerging technology for evaluating tissue biochemical characteristics like oxygenation and water content.
  • Clinical data on HSI in critically ill patients remain limited.

Purpose of the Study:

  • To investigate the utility of HSI in assessing microcirculatory alterations in septic patients.
  • To correlate HSI-derived parameters with clinical severity scores (SOFA) and patient outcomes.
  • To evaluate the reliability and potential of HSI for monitoring critically ill patients.

Main Methods:

  • The TIVITA® Tissue System was used to measure tissue oxygenation (StO2), Tissue Hemoglobin Index (THI), Near Infrared Perfusion Index (NPI), and Tissue Water Index (TWI).
  • Measurements were taken on 25 healthy volunteers and 25 septic patients at the palm, fingertip, and knee.
  • Septic patients were monitored over 72 hours, with HSI results correlated against daily SOFA scores.

Main Results:

  • HSI demonstrated high retest reliability in healthy volunteers.
  • Septic patients exhibited significantly lower StO2 and NPI, and higher TWI compared to controls.
  • THI predicted mortality, while TWI correlated with SOFA scores, indicating potential for risk stratification and edema evaluation.

Conclusions:

  • HSI reveals a unique microcirculatory pattern in sepsis, characterized by reduced oxygenation, perfusion, and increased tissue water.
  • THI and TWI show promise for risk stratification and edema assessment in critically ill septic patients.
  • HSI offers new perspectives for microcirculatory monitoring and guiding future therapeutic strategies in intensive care.