1. Patients and their family members refuse to accept the clinical trial;

2. Complicated with acute cholangitis, gastrointestinal bleeding or ascites, etc.;

3. Hepatic encephalopathy, psychosis or neuropathy;

4. Body weight for acid-base and electrolyte imbalances, endotoxemia, and cachexia decreased by more than 2% or 5% in the past 2 months or 6 months.

5. Uncontrolled hypertentsion, coronary heart disease, diabetes.

Effects of Abdominal Nerve Block on Postoperative Recovery in Patients Undergoing Gastrointestinal Surgery