Glucagon-Like Peptide-1 (GLP-1) Receptor Agonist Anesthesia Risks

Elevated Aspiration Rates Identified in Surgical Patients

Glucagon-like peptide-1 receptor agonists (GLP-1 RAs) are associated with a higher rate of pulmonary aspiration and regurgitation during anesthesia. Researchers led by Thomas E. Potter, M.B.B.S., from Guy's and St Thomas' National Health Service (NHS) Foundation Trust in London, tracked surgical outcomes across the United Kingdom (UK). Their prospective multicenter cohort study examined 47,039 adult surgical patients across 119 UK hospital sites.

The findings appeared in Anaesthesia to coincide with the September 2026 annual meeting of the Association of Anaesthetists in Liverpool. Overall, 2.9 percent of the observed cohort reported using GLP-1 RAs before surgery. Patients took these drugs for metabolic health or weight management prior to undergoing either elective or emergency procedures under an anesthesiologist.

Regurgitation Occurred Most Often during Emergence

Pulmonary aspiration and regurgitation happened eleven times more often in patients receiving GLP-1 RAs than in other patients. Specifically, the combined incidence was 1.41 percent in the GLP-1 RA cohort compared to 0.12 percent in non-users. That difference produced an odds ratio of 11.39.

Timing proved specific. Among patients receiving GLP-1 RAs, pulmonary aspiration and regurgitation occurred most often during emergence from anesthesia. This post-procedure window represents the phase where protective airway reflexes are returning as sedation lifts.

Current Perioperative Management Lacks Consistency

Hospital practices regarding drug cessation and airway protection varied widely across participating UK sites. Anesthesia teams handled medication pauses, induction methods, and airway devices without a single standard approach. This variation mirrors ongoing debates regarding how long patients should pause receptor agonists prior to general anesthesia.

GLP-1 RAs slow gastric emptying. That biological mechanism can leave residual liquid or food in the stomach despite standard pre-operative fasting periods. When stomach contents enter the lungs during anesthesia, severe respiratory complications can follow. Patients managing blood sugar or weight should talk to their surgical team about their medication schedule well before any planned procedure.

Study Scope and Limitations for Clinical Practice

The study relied on observational reporting across clinical sites rather than a randomized trial protocol. Researchers documented real-world practice, which showed that clinical teams managed perioperative drug cessation and airway control inconsistently. Because management varied, the data cannot establish which specific fasting intervals or airway techniques best protect patients.

The authors noted that further prospective studies are needed to test explicit clinical interventions. Future research must evaluate standardized pauses and airway strategies to confirm what reliably mitigates pulmonary aspiration risks. For now, documenting GLP-1 RA use remains a critical pre-operative step for surgical teams.