Mathematical algorithm | Clinical observation | |
---|---|---|
Leakage | Integration (time) of expiratory and inspiratory flow for volume estimation (Vexp and Vinsp) | Curve characteristics: |
Vinsp > Vexp | ||
peff ≠ pinsp | ||
Flowinsp > 50 l/min | ||
Airway occlusion | Integration (time) of expiratory and inspiratory pressure | Curve characteristics: |
ETCO2 ≤ 2%; FO2 = constant | ||
peff = pinsp | ||
Flow ≪ 10 l/min |