Table 4 Update rules for FIO\(_2\) based on current SpO\(_2\) value
From: SOLVe: a closed-loop system focused on protective mechanical ventilation
SpO\(_2\) | Description | Update rule | Update time |
|---|---|---|---|
> high target + 4 | Greatly above target | Decrease FIO\(_2\) by 0.1 | 100 s |
> high target + 2 | Above target | Decrease FIO\(_2\) by 0.05 | 100 s |
> high target | Slightly above target | Decrease FIO\(_2\) by 0.02 | 100 s |
> target middle | Upper target region | If stable: decr. 0.02, else: no change | 20 min |
> low target | Lower target region | No change | – |
< low target | Slightly below target | Increase FIO\(_2\) by 0.02 | 40 s |
< low target -2 | Below target | Increase FIO\(_2\) by 0.05 | 20 s |
\(\le\) 85 | SpO\(_2\) low state | Set FIO\(_2\) to 1.0 | Immediately |