What the trial was testing
The OCULUS enrolled 69 patients with endoscopy preparation. The study was sponsored by The Cleveland Clinic and tracked outcomes across the full group of patients who matched the trial's eligibility profile.
It was long-term safety (phase 4). Trials at this stage are designed to produce evidence regulators and physicians can act on — not just observations to follow up later.
What the results showed
25% retained stomach contents continuing vs. 3% holding one dose.
JAMA Internal Medicine · 2026 · NCT06533527
These findings — that retained stomach contents continuing vs. holding one GLP-1 dose before endoscopy — were published in the JAMA Internal Medicine and represent the headline result of the study.
Researchers tracked outcomes across 69 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.
What this means for patients
For patients with endoscopy preparation, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.
What you can do now
Most U.S. anesthesia and gastroenterology societies now recommend holding the dose of weekly GLP-1 drugs at least one week before procedures requiring sedation. If you take Ozempic, Wegovy, Mounjaro, or Zepbound, ask both your prescribing doctor and the procedure team how to handle dosing — clear liquids the day before may also help.
Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.
Open endoscopy preparation trials
A Study of Barrett's Esophagus Patients to Investigate Quality of Life and Fear of Cancer, and Optimize a Risk Model Based on Biomarkers and New Technologies to Better Predict the Development of Cancer
This study serves, in part, to prepare for a future large cohort study. The goal of the study is: 1. The collection of various tissue samples (blood, biopsies and "esophageal brushes") and their analysis. 2. To set up standardized methods for different genetic analyses (DNA-FISH and so-called single cell sequencing) on the esophageal tissue samples. 3. Evaluating the quality of life of Barrett's Esophagus patients and the degree of fear of getting cancer. Patients with a Barrett's Esophagus can participate in the study if they are minimally 18 years old, are capable of giving informed consent (fully understanding what the study entails before giving consent to participate), have Barrett Esophagus and are referred to one of the participating centers due to suspicion of high-grade dysplasia or early esophageal cancer, for which the participant will be evaluated by endoscopic imaging and biopsy. Study procedures: * An intake consultation will be planned, wherein the eligibility criteria will be assessed, and participant characteristics will be collected. * A routine gastroscopy will be planned twice during which several minimally-invasive interventions will be performed: drawing a blood sample, brush cytology during the endoscopy (a brush is used to obtain cells from the surface of the esophagus) and obtaining biopsy samples (small pieces of tissue). Each participant will need to undergo all the interventions. * Patients will have to complete questionnaires at three time points to assess their quality of life (EQ-5D-DL questionnaire) and fear of cancer recurrence (Cancer Worry Scale).
Frailty in Outpatient Digestive Endoscopy
The increase in our society of the proportion of frail people who suffer from disability and dependency forces us to detect modifiable factors and therefore subject to intervention that can adapt health care for frail patients in order to increase the effectiveness and safety of medical treatments and procedures. A geriatric assessment should be performed on all patients likely to present frailty prior to a digestive endoscopy to assess the risk-benefit of the indication and to improve patient preparation by avoiding adverse effects of endoscopic examinations, increasing the safety and profitability of the tests There are no data in our medium on the prevalence of frailty in patients referred for endoscopy, nor on the incidence in these patients of adverse effects, inadequate preparations, or incomplete examinations, so a frailty study is needed to elaborate multidisciplinary protocols that improve circuits and care in these patients and prevent complications. The questions we want to try to answer are: * Prevalence and severity of fragility in digestive endoscopy. * Specific problems related to fragility in digestive endoscopy, mainly the profitability of the examination and the incidence of adverse effects, in order to create protocols for improving care in this group of patients.