A new non-invasive index for the prediction of endotracheal intubation in patients with SARS COVID-19 infection, in the emergency department, pilot study

Table 2 Diagnostic performance of diaphragm ultrasound for mechanical ventilation

Variable	Thresholds	Se	SP	NPV	PPV	AUC
REXI	2.015	0.659	0.689	0.85	0.425	0.683(0.564–0.801)
LEXI	2.3	0.653	0.648	0.842	0.395	0.672(0.552–0.791)
ROX	6.09	0.807	0.689	0.910	0.477	0.727)(0.604–0.850)
SAFI	156.6	0.769	0.716	0.898	0.487	0.733(0.602–0.863)
PAFI	87	0.769	0.783	0.906	0.555	0.741(0.608–0.874)
U.D.E.S.I.r	1.485	0.769	0.824	0.910	0.606	0.798(0.676–0.920)
U.D.E.S.I.l	1.856	0.653	0.905	0.881	0.708	0.793(0.674–0.911)

Se Sensitivity, SP Specificity, PPV Positive predictive value, NPV Negative predictive value, AUC Area under receiver operating characteristic curve, PAFI Pao2/Fio2 mm Hg, SAFI SaO2/FiO2, ROX Respiratory rate-oxygenation, REXI Right ultrasound diaphragmatic excursion, LEXI Left ultrasound diaphragmatic excursion, U.D.E.S.I.r Ultrasound diaphragmatic excursion So2/FiO2 index right, U.D.E.S.I.l Ultrasound diaphragmatic excursion So2/FiO2 index left

ISSN: 1471-2466