Diaphragmatic ultrasonography-based rapid shallow breathing index for predicting weaning outcome during a pressure support ventilation spontaneous breathing trial

Table 3 Predictive value of RSBI, DE, DTF, DE-RSBI, and DTF-RSBI for weaning failure

Variables	Threshold	AUC (95% CI)	P value	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	LR +	LR −
RSBI, breaths/min/L	> 51.2	0.639 (0.522–0.756)	0.018	64.9	65.8	49	78.7	1.9	0.53
DE, mm	< 13.5	0.771 (0.664–0.877)	< 0.001	64.9	89	74.9	83.3	5.9	0.39
DTF, %	< 30.09	0.868 (0.792–0.944)	< 0.001	78.4	84.9	72.5	88.6	5.19	0.s25
DE-RSBI, breaths/min/mm	> 1.38	0.813 (0.716–0.91)	< 0.001	89.2	65.8	56.9	92.3	2.61	0.16
DTF-RSBI, breaths/min/%	> 78.1	0.859 (0.78–0.939)	< 0.001	67.6	93.2	83.4	85	9.94	0.35

AUC area under the curve, CI confidence interval, PPV positive predictive value, NPV negative predictive value, LR likelihood ratio, RSBI rapid shallow breathing index, DE diaphragmatic excursion, DTF diaphragm thickening fraction, DE-RSBI diaphragmatic excursion rapid shallow breathing index, DTF-RSBI diaphragm thickening fraction rapid shallow breathing index

ISSN: 1471-2466