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Related Experiment Videos

Tissue capnometry: does the answer lie under the tongue?

Alexandre Toledo Maciel1, Jacques Creteur, Jean-Louis Vincent

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

Intensive Care Medicine
|January 15, 2005
PubMed
Summary

Monitoring tissue partial pressure of carbon dioxide (PCO(2)) can indicate poor oxygen supply. Sublingual PCO(2) (P(sl)CO(2)) shows promise for assessing tissue perfusion and guiding treatment in critically ill patients.

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Area of Science:

  • Critical Care Medicine
  • Physiology
  • Biomedical Engineering

Background:

  • Elevated tissue partial pressure of carbon dioxide (PCO(2)) suggests cellular oxygen supply issues.
  • Gastric tonometry, a method for monitoring gastric PCO(2), faces technical challenges and artifacts.
  • Sublingual PCO(2) (P(sl)CO(2)) has emerged as a potential surrogate for tissue perfusion.

Purpose of the Study:

  • To evaluate the utility of sublingual capnometry for monitoring tissue PCO(2).
  • To assess the association between P(sl)CO(2) and circulatory status.
  • To explore the prognostic value of P(sl)CO(2) and the gradient with arterial PCO(2) (DeltaP(sl-a)CO(2)) in critical illness.

Main Methods:

  • Review of experimental and clinical studies on tissue PCO(2) monitoring.

Related Experiment Videos

  • Focus on sublingual capnometry as a less invasive method.
  • Analysis of P(sl)CO(2) values and DeltaP(sl-a)CO(2) in critically ill populations.

    • Main Results:

    • Experimental data suggest P(sl)CO(2) reliably indicates tissue perfusion.
    • Clinical findings link high P(sl)CO(2) and DeltaP(sl-a)CO(2) to impaired microcirculation.
    • These markers are associated with a poorer prognosis in critically ill patients.

    Conclusions:

    • Sublingual capnometry offers a promising approach for tissue PCO(2) monitoring.
    • P(sl)CO(2) and DeltaP(sl-a)CO(2) may serve as valuable indicators of circulatory dysfunction.
    • Further research is needed to fully establish the clinical utility of sublingual capnometry.