What is side stream capnography?
Side-Steam Capnographs: In side-stream capnography, the CO2 sensor is located in the main unit itself (away from the airway) and a tiny pump aspirates gas samples from the patient’s airway through a 6 foot long capillary tube into the main unit.
What are the 2 types of capnography?
There are two types of capnograph, “side stream” and “mainstream” (4) . In the “mainstream” technique, sampling window is in the ventilator circuit and measures CO2, while in the “side stream”, the gas analyzer is located out of the ventilator circuit.
What is a Capnometer used for?
Capnometry measures carbon dioxide in expired air and provides the clinician with a noninvasive measure of the systemic metabolism, circulation and ventilation.
How do colorimetric EtCO2 devices work?
Colorimetric capnography is a qualitative-type device that uses a pH-sensitive impregnated paper that attaches to the end of an endotracheal tube or is built into the exhalation valve of the bag-valve ventilation device. The built-in paper changes from purple to yellow in the presence of exhaled CO2.
What is the difference between mainstream and side stream sampling?
Mainstream capnography is characterized as invasive and non-diverting, meaning that the measurement of the ETCO2 is done at the airway, or the sample site, thus providing a real-time measurement of the carbon dioxide pressure. Sidestream, on the other hand, is non-invasive and diverting.
How does a colorimetric device work?
In a colorimeter, a beam of light with a specific wavelength is passed through a solution via a series of lenses, which navigate the colored light to the measuring device. This analyzes the color compared to an existing standard. A microprocessor then calculates the absorbance or percent transmittance.
Why is the colorimetric CO2 detector not turning yellow?
Observe CO2 detector for color change only during the exhalation phase when CO2 is removed from the lungs. No change in color will result if there is no CO2 to be exchanged. Colorimetric devices may be left in place for up to 2 hours during the resuscitation process.
What color should CO2 detector be?
The indicator panel is blue when no CO2 is present, green at intermediate concentrations of CO2, and yellow when approximately 5% CO2 is present. A permanent blue or blue-green color indicates the absence of exhaled CO2.