Gut Oxygen Therapy for Ischemic-Hypoxic Bowel Disease

Eligible subjects meeting all inclusion criteria and none of the exclusion criteria will be randomized in a crossover manner within the individual to receive, via a deep intestinal catheter, either 500 mL of oxygen or placebo (sham group), administered at three separate time points over the course of one day. The data of test results before and after treatment were collected to evaluate the efficacy and safety of gut oxygen therapy.

Inclusion criteria

• Definite diagnosis of chronic heart failure or obstructive sleep apnea (OSA) with chronic hypoxia;
• Comorbid intestinal dysmotility (abdominal distension, constipation, diarrhea, or abdominal pain);
• Disease duration ≥1 month with poor response to conventional treatment;
• Tolerability of transendoscopic enteral tubing (TET) with successful placement of the tube at the ileocecal junction;
• Age 18-80 years;
• Able to cooperate with bed rest therapy and provide written informed consent.

Exclusion criteria

• Oxygenation index >400 without supplemental oxygen and/or resting oxygen saturation ≥96%;
• Primary organic gastrointestinal diseases, intestinal obstruction, inflammatory bowel disease, or severe hepatic/renal failure;
• Hemodynamically unstable, unable to tolerate sequential intervention (time-sequenced intervention);
• Presence of cough or spinal disorders that prevent maintaining a resting state during bed rest;
• Failure of arterial catheterization or endoscopic tube placement;
• Mental or cognitive impairment that precludes cooperation with assessments.