The Value of Diaphragmatic Ultrasound in Non-invasive Oxygen Therapy

Department of Pulmonary & Critical Care Medicine, Chinese PLA General Hospital

In this study, a single-center, prospective, observational study was adopted to set the cut-off values of diaphragmatic ultrasound results and arterial blood gas results，with the choice of non-invasive oxygen therapy as the gold standard,so as to evaluate the diagnostic value of diaphragmatic ultrasound in the selection of non-invasive oxygen therapy.

1. the cut-off values of diaphragmatic ultrasound results and arterial blood gas results were established by the selection results of non-invasive oxygen therapy of 120 patients in the intensive care unit and using receiver operating Characteristic curve.

diaphragm excursion，inspiratory time，diaphragm contraction velocity，diaphragm excursion time

Inclusion Criteria:

• patients older than 18 years
• without Invasive mechanical ventilation when entering the intensive care unit.

Exclusion Criteria:

• have noninvasive ventilation or high flow nasal cannula contraindications
• history of neuromuscular disease chest wall deformities
• previously assessed diaphragmatic palsy
• shock or severe hemodynamic instability
• known pregnancy, and/or need for immediate endotracheal intubation