TABLE 3

Influence of support level, breathing pattern and respiratory drive on sensitivity and prevalence of asynchronies

VariablesRange#Sensitivity ≥0.20Linear trend for sensitivityAI ≥10%Linear trend for prevalence
PS cmH2O<1022.2%p=0.10233.3%p=0.491
10–1250.0%57.1%
>1260.0%50.0%
VT mL<57060.0%p=0.07250.0%p=0.654
570–85150.0%55.0%
>85120.0%40.0%
RRmec breath·min−1<190.0%p=0.14650.0%p=0.371
19–2555.0%60.0%
>2538.9%30.0%
EAdipeak µV<1030.0%p=0.99960.0%p=0.178
10–2260.0%55.0%
>2230.0%30.0%

AI: asynchrony index; PS: inspiratory pressure support; VT: tidal volume; RRmec: ventilator rate of cycling; EAdipeak: peak electrical activity of the diaphragm. #: defined by percentiles.