This single-center, double-blind, randomized, intra-individual crossover controlled study aims to investigate the efficacy and safety of intestinal oxygen therapy via a deep intestinal catheter as a targeted route for intestinal oxygen delivery in the treatment of ischemic-hypoxic enteropathy, and simultaneously to explore and verify the chronobiological differences. Data have been obtained from the study based on the first version of our pilot study. Considering ethics and cost-effectiveness, a new protocol needs to be designed to achieve the research goals with minimal intervention, minimal cost, and the smallest sample size.
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;
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;