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Inaccuracy in Capnography due to moisture

inaccuracy in capnography due to moisture

Nowadays, the majority of capnometers use NDIR-based sensors. It has light-transmitting and light-absorbing properties that allow it to accurately measure the concentration of CO2 in a patient’s breathing.

The sidestream capnometer has a small pump which continuously takes the air sample from patients’ breathing and transfers it to the sensor. If the sampled air has water contamination (moisture), the light emitted by the sensor is reflected and comparatively less absorbed by the receiver in the sensor. Hence, the sensor does not show accurate results. That is the reason, the sidestream capnometer is used with a Water trap system which stops moisture going to the sensor.

Same way, the mainstream sensor is directly attached to the patient’s ventilator tubes and follows the same problem but it can be avoided using HMF (Heat and moisture exchange filter). To avoid this issue, the mainstream sensor is attached between the HMF filter and the ventilatory tube.

To get accurate results, the capnometer needs to be used with specific guidelines. Because it can give you better results.

Click here to learn more interesting things about capnometers.

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1 thought on “Inaccuracy in Capnography due to moisture”

  1. Dr Vishnubhai Patel

    Yes this is a good information about capnometers to measure CO2 in patients’s breathing. It gives important information about CO2 concentration in body air .

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AUTHOR
Krunal Prajapati
Krunal Prajapati
Entrepreneur | Engineer | Blogger
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