Study on the Measurement Method of the Left Diaphragm

To Study the Consistency of Multiple Measurement Methods of Left Diaphragm Mobility in Critically Ill Patients

This study intends to use ultrasound to measure the bilateral diaphragmatic ultrasound indicators in critically ill patients, focusing on the left diaphragm, and to explore the consistency and reliability among various ultrasound indicators to evaluate the diaphragmatic mobility

Inclusion Criteria:

• ①Adult patients (≥18 years old) of both sexes;

  • In invasive group, intubation or tracheotomy was changed to 5L/min T-tube or tracheotomy mask oxygen inhalation;

    • Patients in non-invasive group were treated with mask oxygen 5L/min;

      • agree to participate in the trial and sign the informed consent;

Exclusion Criteria:

• ①The diaphragm ultrasound operation site was too large to obtain images.

  • Diaphragmatic ultrasound images could not be obtained in any section;

    • The ultrasound image quality of any section was poor;

      • the presence of phrenic nerve injury/paralysis ⑤ pregnant women; ⑥ Neuromuscular diseases such as ALS and myasthenia gravis affect the evaluation of spontaneous breathing ⑦ Patients deemed by the investigator to be ineligible.