Respiratory Function Monitoring of Mechanical Ventilation in Patients With Chest Blunt Injury

Inclusion Criteria: * Patients with severe chest contusion admitted to the intensive care unit (ICU); * Abbreviated Injury Scale (AIS) ≥ 3 and/or Blunt Pulmonary Contusion 18 score (BPC18) ≥ 3; * Age range from 18 to 90 years old; * Mechanical ventilation; * Stay in the ICU for less than 12 hours. Exclusion Criteria: * Perinatal women; * Expected to be mechanically ventilated for less than 48 h; * Expected duration of stay in the ICU is less than 24 hours; * There are contraindications for the use of EIT (pacemaker implantation, local skin wounds after chest surgery, etc.); * Accept extracorporeal membrane oxygenator; * Mechanical ventilation\>7 days; * Confirmed ventilator-associated pneumonia; * Pneumothorax without drainage or presence of subcutaneous emphysema.