Different effects of cardiac and diaphragm function assessed by ultrasound on extubation outcomes in difficult-to-wean patients: a cohort study

Table 3 The parameters of the ROC curve of the predictors of respiratory failure within 48 h

Variables	OR	95% CI	P-value	Cut-off value	AUC	Sensitivity	Specificity
Chronic respiratory diseases	5.013	0.738–34.067	0.099	NA	NA	NA	NA
Duration from onset to the first intubation	1.269	0.989–1.627	0.061	NA	NA	NA	NA
PH after SBT	< 0.001	0–3.322	0.066	NA	NA	NA	NA
PaCO₂ after SBT	1.146	0.980–1.340	0.088	NA	NA	NA	NA
LVEF	0.904	0.833–0.981	0.015	≤ 52	0.646	34.5%	96.8%
E/Ea (average) after SBT	1.450	1.092–1.926	0.010	≥ 12.5	0.789	72.4%	77.4%

AUC area under curve, CI confidence interval, E/Ea the ratio of mitral Doppler inflow velocity to annular tissue Doppler wave velocity, LVEF left ventricular ejection fraction, NA not available, PaCO ₂ arterial carbon dioxide tension, OR odds ratio, ROC receiver operating characteristic curve, SBT spontaneous breathing trial

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