Efficacy and Safety of Sivelestat in Preventing Postoperative Acute Lung Injury or Acute Respiratory Distress Syndrome After Cardiac Surgery

(1)Experimental group: Received intravenous sivelestat sodium admission to the ICU. Sivelestat sodium was dissolved in 0.9% sodium chloride injection and a one-day dose (4.8mg/kg) was diluted in 50ml of 0.9% sodium chloride injection, which was then sealed for continuous intravenous administration at a rate of 0.2 mg/kg/h for seven consecutive days.

2)Control group: Receiving the same dose of placebo, 50 ml of saline, were administered intravenously at a rate of 0.2 mg/kg throughout the treatment period without any discernible impact on patient's regular treatment regimen.