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Volumetric capnography. Sophisticated CO2 measurement

Graphic illustration: magnifying glass

For more insights. Volumetric CO2 monitoring

The phases of a volumetric capnogram, the shape and curve morphology, and measurements based on calculations derived from it can tell you an important story about:

  • Ventilation‑perfusion efficiency
  • Physiologic dead‑space fraction
  • Patient's metabolic rate (Jaffe MB. Using the features of the time and volumetric capnogram for classification and prediction. J Clin Monit Comput. 2017;31(1):19‑41. doi:10.1007/s10877‑016‑9830‑z1​)
CAPNOSTAT-5 Mainstream CO2 sensor

A powerful tool. The CO2 sensor

On our ventilators, CO2 is measured with a CAPNOSTAT‑5 mainstream CO2 sensor proximal to the patient's airway.

The CAPNOSTAT‑5 sensor gives you precise measurements of end‑tidal carbon dioxide (PetCO2), and a clear, accurate capnogram at all respiratory rates of up to 150 breaths per minute.

Statistic graphic: CO2 sensor data analysis

Little sensor, big data. This is what you get

The volumetric capnogram window on the display shows exact quantitative information as a combination of proximal flow and proximal CO2 data such as:

  • Current volumetric capnogram curve
  • Volumetric capnogram reference curve
  • Reference curve button with time and date of reference loop
  • Most relevant CO2 values, breath by breath

To allow a more comprehensive analysis of the patient condition, a 72‑hour trend (or 96‑hour with HAMILTON‑G5/S1) is available for:

  • PetCO2
  • V‘CO2
  • FetCO2
  • VeCO2
  • ViCO2
  • Vtalv
  • V'alv
  • VDaw
  • VD/Vt
  • VDaw/VTE
  • Slope CO2

To make your life easier, Hamilton Medical ventilators offer an overview of all relevant CO2‑related values in the Monitoring CO2 window.

  • Fractional end‑tidal CO2 concentration: FetCO2 (%) 
  • End‑tidal CO2 pressure: PetCO2 (mmHg) 
  • Slope of the alveolar plateau on the PetCO2 curve, indicating the volume/flow status of the lungs: slopeCO2 (%CO2/l)
  • Alveolar tidal ventilation: Vtalv (ml) 
  • Alveolar minute ventilation: V’alv (l/min) 
  • CO2 elimination: V’CO2 (ml/min) 
  • Airway dead space: VDaw (ml)
  • Airway dead‑space fraction at the airway opening: VDaw/VTE (%) 
  • Exhaled CO2 volume: VeCO2 (ml) 
  • Inspired CO2 volume: ViCO2 (ml)

See it with your own eyes. Book a free personal demonstration or schedule a callback

Let us guide you through all the benefits of volumetric capnography, and see it directly in action. Book a free personal demonstration with one of our specialists:

References

  1. 1. Jaffe MB. Using the features of the time and volumetric capnogram for classification and prediction. J Clin Monit Comput. 2017;31(1):19‑41. doi:10.1007/s10877‑016‑9830‑z

 

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Using the features of the time and volumetric capnogram for classification and prediction.

Jaffe MB. Using the features of the time and volumetric capnogram for classification and prediction. J Clin Monit Comput. 2017;31(1):19‑41. doi:10.1007/s10877‑016‑9830‑z

Quantitative features derived from the time‑based and volumetric capnogram such as respiratory rate, end‑tidal PCO2, dead space, carbon dioxide production, and qualitative features such as the shape of capnogram are clinical metrics recognized as important for assessing respiratory function. Researchers are increasingly exploring these and other known physiologically relevant quantitative features, as well as new features derived from the time and volumetric capnogram or transformations of these waveforms, for: (a) real‑time waveform classification/anomaly detection, (b) classification of a candidate capnogram into one of several disease classes, (c) estimation of the value of an inaccessible or invasively determined physiologic parameter, (d) prediction of the presence or absence of disease condition, (e) guiding the administration of therapy, and (f) prediction of the likely future morbidity or mortality of a patient with a presenting condition. The work to date with respect to these applications will be reviewed, the underlying algorithms and performance highlighted, and opportunities for the future noted.