Residual Gastric Contents

This prospective observational study will evaluate the association between the time interval since the last dose of glucagon-like peptide-1 receptor agonists (GLP-1 RAs) and residual gastric contents before elective surgery. Adult patients receiving GLP-1 RAs and scheduled for elective non-cardiac surgery under general anesthesia will undergo preoperative point-of-care gastric ultrasound. The study will assess whether longer GLP-1 RA cessation intervals are associated with lower ultrasound-estimated gastric volume and a lower frequency of high-risk gastric contents. Body mass index will also be evaluated as a potential modifier of this association.

The goal of this clinical trial is to assess differences in residual gastric volumes after stopping Miralax ingestion at different time points (1-4 hours) prior to anesthesia induction.

The aim of this randomised controlled trial is to determine the effect of a 24-hour clear liquid diet compared to standard fasting guidelines on the proportion of participants who present with increased residual gastric contents during their study visit. It also aims to determine the effect of a 24-hour clear liquid diet compared to standard fasting guidelines on: * Solid content or thick fluids * Patient-reported outcome measures (PROMs), including thirst, hunger, nausea, fatigue, and anxiety. * Compliance measures, including adherence with the intervention, time since last oral intake of solid foods, and time since last oral intake of clear liquids. We will enrol adults who are currently using any once-weekly glucagon-like peptide-1 receptor agonist (GLP-1RA) medication. Participants will be allocated in a 1:1 ratio to follow a 24-hour clear liquid diet or standard fasting guidelines prior to attending a study visit where participants will undergo a blinded gastric ultrasound assessment.