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End-tidal carbon dioxide (ETCO2) has increasingly been used in clinical settings as a non-invasive monitoring technique. Due to its small size and ease of connection, it has become a regular feature in ambulances. ETCO2 is the gold standard for confirming advanced airway placement. It can also determine the survival likelihood of cardiac arrest patients, assess the severity of sepsis, identify pulmonary embolism earlier than SpOand detect respiratory depression following the administration of midazolam.


The Application of the ETCO2 Sensor in Advanced Airways


The most typical installation method: place a filter between the artificial airway and the ETCO2 sensor. This not only prevents airway secretions from contaminating the sensor but also avoids occupational exposure for healthcare personnel.


Additionally, the ETCO2 sensor can be connected to a mask. Though not common, this installation method is similar to that of an artificial airway, with the only difference being that the filter needs to be placed between the mask and the ETCO2 sensor.


Methods of Connecting the ETCO2 Sensor


Insert the ETCO2 sensor cable into the ETCO2 socket on the side panel of the monitor and select a suitable airway adapter, then connect the airway adapter or sampling line.


Embed the airway adapter onto the ETCO2 device. When connecting the airway adapter to the sensor, ensure the window of the airway adapter is clean and dry. If necessary, clean or replace the airway adapter.


Wait for the airway adapter and ETCO2 sensor to warm up. A prompt on the screen indicating "Warming up" signifies that the sensor and airway adapter are reaching their working temperature. This prompt will disappear once the sensor has fully warmed up.


Advantages of Mainstream ETCO2 Monitoring


  • Short Warm-Up Time and Fast Response.


  • The ETCO2 sensor is external to the patient's breathing circuit, eliminating the need for gas sampling.


  • High measurement accuracy.


  • The anaesthesia accessories are suitable for monitoring patients with small tidal volumes.


  • No Exhaust Emissions.


In summary, ETCO2 monitoring is a non-invasive, convenient, real-time, and continuous functional detection indicator. The normal range for ETCO2 in healthy individuals is 32-43 mmHg. Correctly interpreting the ETCO2 waveform is crucial for its clinical application. Additionally, it is important to recognize influencing factors and eliminate interference factors. The application of ETCO2 in cardiopulmonary resuscitation includes alerting to cardiac arrest events, evaluating the effectiveness of CPR, assessing artificial airways, monitoring ventilation functions, and predicting prognosis.

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