The role of diaphragmatic ultrasound as a predictor of successful extubation from mechanical ventilation in respiratory intensive care unit

The Egyptian Journal of Bronchology

Table 2 Diagnostic accuracy of a new weaning index (diaphragmatic index) with tidal breathing, during deep breathing and traditional weaning

Variables	Cutoff	Sensitivity	Specificity	PPV	NPV	AUC	p
Traditional weaning
PaO₂/FIO₂	>202.5	61%	95%	73%	92%	84%	< 0.001
RR	<16.5	72%	70%	34%	92%	80%	< 0.001
MV(L/m)	<8.7	42%	90%	47%	87%	68%	0.01
RSBI	<35.5	47%	90%	51%	188%	71%	< 0.001
During tidal breathing
DT Insp	> 21	95%	100%	100%	99%	95%	< 0.001
DT Exp (FRC)	>15.5	62%	100%	100%	92%	85%	< 0.001
DTF%	>32.82	90%	75%	44%	97%	77%	< 0.001
DE	>1.7	68%	65%	30%	90%	73%	< 0.001
During deep breathing
DT Insp (TLC)	>28.5	100%	65%	39%	100%	87%	< 0.001
DT Exp (RV)	>22.5	73%	75%	39%	93%	75%	< 0.001
DTF %	>37	97%	100%	100%	99%	100%	< 0.001
DE	>3.1	75%	55%	27%	91%	68%	0.01

PPV positive predictive value, NPV negative predictive value, AUC area under a curve, p is considered significant if < 0.05