Gut Oxygen Therapy for Ischemic-Hypoxic Bowel Disease

Inclusion Criteria: * Clinical diagnosis of intestinal ischemia and hypoxia-related diseases caused by conditions such as ischemic bowel disease, heart failure, etc., presenting with recurrent or persistent abdominal pain and/or distension, and difficulty in defecation. Examples include: heart failure-related defecation difficulty, severe malnutrition combined with defecation difficulty, acute ischemic bowel disease, and chronic ischemic bowel disease. * At least able to perform bedside activities and able to defecate in conventional positions (sitting or squatting). * Age ≥18 years, and able to voluntarily sign informed consent. Exclusion Criteria: * Acute intestinal emergencies such as acute intestinal obstruction, intestinal perforation, or active massive gastrointestinal bleeding. * Intestinal fistula. * History of abdominal surgery within the recent past (\<1 month). * Severe uncontrolled arrhythmia or respiratory failure. * Cardiac function Class IV (NYHA Class IV). * Patients with abnormal visceral pressure sensitivity. * Inability to cooperate with study assessments. * Other conditions that, in the opinion of the investigator, make the subject unsuitable for inclusion.