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
Study Type
OBSERVATIONAL
Enrollment
120
Department of Pulmonary and Critical Care Medicine, Chinese PLA General Hospital
Beijing, Beijing Municipality, China
RECRUITINGthe data diaphragmatic ultrasound
Record the data at the baseline and intervention
Time frame: When the intervention which is the first time to change the oxygen therapy
Arterial blood gas analysis results
Record the data at the baseline and intervention
Time frame: When the intervention which is the first time to change the oxygen therapy
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