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[Checking the precision of capnometers].

R Zander1, F Mertzlufft

  • 1Institut für Physiologie und Pathophysiologie der Johannes-Gutenberg-Universität Mainz.

Anasthesiologie, Intensivmedizin, Notfallmedizin, Schmerztherapie : AINS
|February 1, 1992
PubMed
Summary
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Capnometry measures CO2 partial pressure but requires corrections for humidity, N2O, and O2. This study evaluated 10 capnometers, finding reproducibility within +/- 1 mmHg for CO2 levels between 30-50 mmHg.

Area of Science:

  • Anesthesiology and Respiratory Monitoring
  • Medical Instrumentation and Technology

Context:

  • Capnometry is crucial for monitoring respiratory function, providing real-time CO2 measurements.
  • Sidestream capnometers require specific corrections due to gas drying, affecting CO2 partial pressure (pCO2) accuracy.
  • Infrared spectroscopy used in capnometry can lead to overestimation or underestimation of pCO2 in the presence of other gases like N2O and O2.

Purpose:

  • To evaluate the precision of mainstream and sidestream capnometers.
  • To assess the impact of water vapor, oxygen, nitrous oxide, and barometric pressure on capnometer accuracy.
  • To determine the necessary corrections for accurate pCO2 measurements.

Summary:

  • Ten capnometers (2 mainstream, 8 sidestream) were tested using dry and humidified gases with defined CO2, O2, N2, N2O, and H2O concentrations.

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  • Evaluations focused on pH2O correction, effects of O2 and N2O, and dependence on barometric pressure.
  • Results demonstrated reproducibility of approximately +/- 1 mmHg for pCO2 within the 30-50 mmHg range across all tested devices.

    • Impact:

    • Highlights the importance of understanding capnometer principles, limitations, and necessary corrections for clinical application.
    • Provides data on the precision of various capnometry devices, aiding in selection and use.
    • Emphasizes the need for accurate calibration and consideration of environmental factors for reliable pCO2 monitoring.