Influence of CO2 signal quality on INTELLiVENT-ASV automatic MinVol management

11.11.2019
Author: Clinical Experts Group, Hamilton Medical, Reviewer: N/A

Incorrect positioning of the CO2 mainstream sensor may affect the quality of the signal. When using INTELLiVENT®-ASV®, an unreliable signal may in turn affect the automated adjustments, as these are dependent on the quality index of the signal from the sensor.

If a PetCO2 signal is unavailable or of poor quality for more than 30 seconds, the Ventilation adjustment OFF alarm will be generated. The %MinVol control becomes a solid red circle that is frozen and automatic adjustment of the %MinVol stops. In this case, a constant minute ventilation equal to the last valid automatic %MinVol setting will be applied.

Figure 1: Indices showing poor signal quality that will cause automated ventilation management to stop 

 

 

 


 

The poor quality of the signal is indicated by gray, red and orange bars on the display. Once a reliable PetCO2 signal is available again, the %MinVol control becomes a blue rotating circle and the bars turn green.  The alarm is reset and automated ventilation management resumes.

Therefore, correct placement and positioning of the sensor is very important.

Place the sensor/airway adapter assembly at the proximal end of the airway circuit as shown.

Figure 2: Recommended setup of the breathing circuit

 

 

 

 

 

  • Do not place the airway adapter between the ET tube and the elbow, as this may allow patient secretions to accumulate in the adapter.
  • Position the airway adapter with its windows in a vertical, not a horizontal, position. This helps keep patient secretions from pooling on the windows. 
Figure 3: Vertical positioning of the sensors

 

 

 

 

 


 

 

 

Relevant devices: HAMILTON-G5/S1 (SW v2.6x), HAMILTON-C6 (SW v1.x.x), HAMILTON-C3 (SW v2.0.2)

Sensor Placement, Intellivent, Capnography, Ventilation Controller, Airway Adapter, Flow sensor
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Date of Printing: 08.12.2019
Disclaimer:
The content of this Knowledge Base is intended for informational purposes only. Hamilton Medical AG provides no warranty with respect to the information contained in this Knowledge Base and reliance on any part of this information is solely at your own risk. For detailed instructions on operating your Hamilton Medical device, please refer to the official Hamilton Medical Operator’s Manual for the respective device.