Capnography and Cardiac Output Determination

  • G. Murias
  • A. Villagra
  • L. Blanch
Conference paper


Since gas transfer across the alveolar capillary wall does not depend on active transport, the lung may be used as an aerotonometer, allowing the alveolar gas to equilibrate with the mixed venous blood. The analysis of this alveolar gas provides an indirect method for measuring mixed venous carbon dioxide tension (pvCO2). The equilibration method, using a bag containing a high concentration of carbon dioxide in oxygen, has been shown to accurately measure oxygenated pvCO2 and application of this method has led to the development of the non-invasive determination of cardiac output (CO) by the CO2 rebreathing. Several studies have demonstrated the validity of this indirect Fick method in healthy subjects, in patients with cardiac dysfunction, in patients with obstructive airway disease, and in patients receiving mechanical ventilation [1, 2, 3, 4, 5].


Cardiac Output Pulmonary Artery Catheter Rebreathing Method Cardiac Output Determination Rebreathing Technique 
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Copyright information

© Springer-Verlag Italia 2002

Authors and Affiliations

  • G. Murias
    • 1
  • A. Villagra
    • 1
  • L. Blanch
    • 1
  1. 1.Critical Care Centre, Sabadell HospitalParc Taulí University InstituteSabadellSpain

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