Table 1 Asynchrony definitions for airway flow and pressure detection as described by Thille et al. [1], referred to as AI Thille
From: An automated and standardized neural index to quantify patient-ventilator interaction
Type of asynchrony | Definition |
|---|---|
Ineffective triggering | An abrupt airway pressure drop (≥ 0.5 cmH2O) simultaneous to a flow decrease (in absolute value) and not followed by an assisted cycle during the expiratory period. |
Double-triggering | Two cycles separated by a very short expiratory time, defined as less than one-half of the mean inspiratory time, the first cycle being patient-triggered |
Autotriggering | A cycle delivered by the ventilator without a prior airway pressure decrease, indicating that the ventilator delivered a breath that was not triggered by the patient |
Short cycle | Inspiratory time less than one-half the mean inspiratory time |
Prolonged cycle | Inspiratory time greater than twice the mean inspiratory time |