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Related Experiment Videos

Sublingual capnometry tracks microcirculatory changes in septic patients.

Jacques Creteur1, Daniel De Backer, Yasser Sakr

  • 1Department of Intensive Care, Erasme University Hospital, Route de Lennik 808, 1070, Brussels, Belgium.

Intensive Care Medicine
|February 18, 2006
PubMed
Summary

Microcirculatory blood flow significantly impacts sublingual carbon dioxide pressure in septic shock patients. Sublingual capnometry offers a non-invasive method to monitor these critical microcirculatory changes.

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Area of Science:

  • Critical Care Medicine
  • Hemodynamics
  • Microcirculation Research

Background:

  • Septic shock is characterized by circulatory dysfunction.
  • Assessing microcirculatory alterations is crucial for patient management.
  • Sublingual carbon dioxide pressure (P_subCO2) is a potential marker for tissue perfusion.

Purpose of the Study:

  • To investigate the relationship between microcirculatory blood flow and P_subCO2 in septic shock.
  • To determine if P_subCO2 can serve as a non-invasive indicator of microcirculatory status.

Main Methods:

  • Prospective study of 18 mechanically ventilated septic shock patients.
  • Dobutamine infusion was administered to augment blood flow.
  • Sublingual P_subCO2, sublingual microcirculation (orthogonal polarization spectral imaging), and gastric mucosal P_CO2 were monitored.

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  • Sublingual and gastric P_CO2 gaps were calculated.

    • Main Results:

    • Dobutamine increased cardiac index and oxygen saturation.
    • Dobutamine significantly reduced the sublingual P_CO2 gap.
    • The sublingual P_CO2 gap correlated strongly with the proportion of well-perfused capillaries.
    • Changes in the sublingual P_CO2 gap mirrored improvements in microcirculation.

    Conclusions:

    • Regional microcirculatory blood flow is the primary determinant of sublingual P_CO2.
    • Sublingual capnometry is a promising, non-invasive tool for monitoring microcirculatory dysfunction in sepsis.