Reverence for life, attention to anesthesia...
End-expiratory carbon dioxide partial pressure (PetCO2) is a measurement of the CO2 pressure in the exhaled gas at the end of exhalation. It is an important monitoring tool to improve the safety of endotracheal intubation and can effectively monitor the patency and effectiveness of ventilation.
A normal end-expiratory CO2 partial pressure waveform looks like this:
Phase I: the baseline of inhalation, at the zero position, is the beginning of the exhalation, and the exhaled breath is a dead space in the respiratory tract, basically free of carbon dioxide;
Phase II: expiratory ascending branch, steep and straight, a mixture of alveoli and ineffective cavities;
Phase III: expiratory plateaul, horizontal or slightly upward, mixed with alveolar air, the end of the platform is the PETCO2 value of end-expiratory airflow;
Phase VI: Aspiration descends, the carbon dioxide curve drops rapidly and steeply to baseline, and fresh gas enters the airway.
Through the end-expiratory carbon dioxide partial pressure waveform, we can judge the airway obstruction and improve ventilation conditions, but as the number of uses increases, the sink and sampling tube will always have such and such problems, such as the waveform sometimes looks like this:
Or something like this:
What is the reason? The water vapor condensation in the sampling tube causes the pipeline to be unsmooth, and we can do this: align the oxygen intake pipe with the anesthesia machine and flush the water droplets out with high air flow.
After this operation, the normal waveform will be perfectly rendered:
END
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