What Anesthesiologists Need to Know About Patients on GLP-1 Drugs Before Surgery | Research

The takeaway

GLP-1 receptor agonists delay gastric emptying, creating aspiration risk during anesthesia — requiring specific perioperative protocols for the growing number of patients on these medications.

Delayed gastric emptying
GLP-1 receptor agonists slow stomach emptying, risking aspiration during anesthesia despite standard fasting

What the researchers found

GLP-1 receptor agonists delay gastric emptying across multiple tissue sites, creating clinically significant aspiration risk during anesthesia that requires modified perioperative fasting and medication management protocols.

Why it matters

With the explosion of GLP-1RA prescribing, anesthesia providers are seeing these patients daily. Delayed gastric emptying can turn a routine surgery into a dangerous aspiration event if standard fasting protocols are assumed to be sufficient.

The numbers in context

GLP-1RAs shown to provide reliable weight loss and improved glycemic control; improve cardiovascular outcomes in high-risk populations; cause delayed gastric emptying.

How the study worked

Clinical review addressing perioperative implications of GLP-1 receptor agonists for anesthesia professionals, covering pharmacology, organ effects, and clinical management recommendations.

Who was studied

Surgical patients taking GLP-1 receptor agonists

What this study cannot tell us

Review article — does not provide new clinical data. Specific timing recommendations for medication withholding may evolve as evidence accumulates. Individual patient factors (dose, duration of therapy, specific agent) affect gastric emptying differently.

How to read the evidence

Moderate evidence — well-established pharmacological effects supported by clinical observation, though optimal perioperative protocols are still being refined.

When this study was published

Published in 2024. Addresses an increasingly urgent perioperative concern as GLP-1RA use expands.

The bigger picture

The perioperative management of GLP-1RA patients is becoming a significant challenge across healthcare systems. Professional anesthesia societies are actively developing and updating guidelines, but the rapid adoption of these drugs has outpaced guideline development in many settings.

Questions still open

Should all GLP-1RA patients have point-of-care gastric ultrasound before anesthesia induction?
How many days before surgery should GLP-1RAs be held to normalize gastric emptying?
Do weekly and daily GLP-1RAs require different perioperative protocols?

Common questions

Why do doctors worry about GLP-1 drugs before surgery?

GLP-1 drugs slow down how fast your stomach empties. Before surgery, you're told to fast so your stomach is empty — but on these drugs, food can stay in your stomach much longer than normal. If there's food in your stomach when you go under anesthesia, you could inhale it into your lungs (aspiration), which is dangerous.

Should I stop my GLP-1 medication before surgery?

Your surgeon or anesthesiologist will give you specific instructions. Generally, GLP-1 drugs may need to be paused several days before surgery. Always tell your surgical team that you take these medications during your preoperative appointment so they can plan accordingly.

Read the original research

Perioperative Considerations for Patients on GLP1 Agonists.

Advances in anesthesia, 42(1), 1-26

View on PubMed ↗Publisher’s paper ↗

Citation

VanderWielen, Beth A; Brian Beam, William. (2024). Perioperative Considerations for Patients on GLP1 Agonists.. Advances in anesthesia, 42(1), 1-26. https://doi.org/10.1016/j.aan.2024.07.002