The Impact of GLP-1 Receptor Agonists On Endoscopy
BY JANA G. AL HASHASH, MD, MSc, AGAF
Glucagon-like peptide 1 receptor agonists (GLP-1 RAs) have been approved for the treatment of type 2 diabetes mellitus since 2005. They have become more widely used over the last couple of years for weight loss in individuals who suffer from adiposity-based chronic disease.
The remarkable positive effects that GLP-1 RAs have had on weight loss as well as other medical conditions such as heart disease, hypertension, metabolic dysfunction–associated steatotic liver disease, among many others, have gained these drugs more traction. Even in situations when insurance companies deny coverage of GLP-1 RAs, many patients have been resorting to other routes to obtain these medications, commonly by purchasing them from online compounding pharmacies.
As such, more and more of our patients who present to endoscopy suites across the country are on one of the available GLP-1 RAs. This has necessitated endoscopists and anesthesiologists to become more familiar with the impact of GLP-1 RAs on patients undergoing endoscopic procedures.
Similar to narcotics, GLP-1 RAs affect gastrointestinal motility and delay gastric emptying. Common side effects of patients receiving GLP-1 RAs include nausea, vomiting, and increased satiety. Patients on GLP-1 RAs for weight loss may also have other contributing risk factors for gastroparesis such as diabetes mellitus which may further delay gastric emptying.
For endoscopists, our goals are to achieve the highest quality examination in the safest way possible. As such, being on a GLP-1 RAs could compromise both goals; but to date, the exact impact of these drugs on exam quality and patient safety is yet to be determined.
Mayo Clinic
Dr. Jana G. Al Hashash
Studies have shown that patients on GLP-1 RAs have increased gastric residue on upper endoscopy compared with patients not on GLP-1 RAs. The effect of this increased residue on aspiration risk and clinically meaningful patient outcomes is being investigated, and the available published data are conflicting. Additionally, other published cases have shown that GLP-1 RAs are associated with increased solid gastric residue but not liquids, and that symptoms of dyspepsia and abdominal bloating are associated with an increased probability of residual gastric content.
Given the valid concern for increased gastric content residue, anesthesia specialists became more strict about which GLP-1 RA users they would agree to sedate, which ones they would intubate, and which procedures they would cancel. As one would imagine, cancellation and intubation rates have been increasing, and these have affected the schedules of patients, their families, and physicians.
The concern with GLP-1 RAs does not only apply to upper endoscopies, but also impacts colonoscopies. In addition to the concerns of aspiration and pneumonia, studies have shown that the use of GLP-1 RAs may be associated with a lower quality of bowel preparation and higher need for repeat colonoscopy. A study, which I believe is critical, showed that patients on GLP-1 RAs who were scheduled for upper endoscopy and colonoscopy were found to have less gastric residue and less risk of complications when compared with patients who were only having an upper endoscopy. This study sets the stage for a modified prep for patients on GLP-1 RAs prior to their procedures, since patients who received a modified/extended liquid diet on the day prior to their procedure (those preparing for a colonoscopy), had a protective effect against retained gastric content.
Clearly, there is a knowledge gap and a need for guidance. In our recently published AGA Rapid CPU, we advised an individualized approach to managing patients on GLP-1 RAs in the pre-endoscopic setting. Factors to consider are the indication for the GLP-1 RAs, the dose being used, duration of use, and indication and urgency of the procedure, as well as the presence of symptoms in the preoperative area (i.e., do patients have any nausea, vomiting, dyspepsia, etc.). Also an important factor is the facility in which the endoscopy will be taking place, as certain centers have the capacity to act fast and prevent complications or address them in a timely manner while other centers may not be prepared.
We proposed that a modified liquid diet be considered in patients prior to their endoscopies by advising patients to adhere to a clear liquid diet the day before the procedure, as this may help decrease gastric residue and be the safest and best approach for patients on GLP-1 RAs. Of course, it is important to note that more prospective studies are needed to inform clinical practice, and until then, we will have to individualize our approach and continue to put patient safety first.
Dr. Al Hashash is a gastroenterologist and associate professor of medicine at Mayo Clinic, Jacksonville, Florida.
