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

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.

The poor quality of the signal is indicated by gray, red and orange bars on the display (see Figure 1). 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 in Figure 2.

• 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. 

Relevant devices with INTELLiVENT-ASV (Not available in the US and some other marketsA​): HAMILTON-G5/S1 (Not available in the US and some other marketsA​) (SW v2.8x and later); HAMILTON-C3/C6 (SW v2.2.x and later / SW v2.0.x and later); HAMILTON.-C1/T1 (SW v3.0.x and later)