Gastric ultrasound is a point-of-care clinical and research tool that has steadily gained popularity to assess gastric content in patients not compliant with fasting rules or with certain comorbidities. Clinical decisions can be made based on the visualised content (e.g. solids, fluids or nothing) or through calculation of gastric volume by measuring antral circumference. In this study the investigators will examine gastric contents in patients who are taking semaglutide and in patients who are not. The investigators will then evaluate whether there is a difference in the incidence of full stomachs and whether gastric ultrasound influenced the anaesthetic plan of the treating anaesthetist. conditions: Gastroparesis studyType: INTERVENTIONAL phases: NA allocation: NA interventionModel: SINGLE_GROUP interventionModelDescription: 45 patients on semaglutide therapy will be included together with 45 age, BMI and diabetes status matched controls. primaryPurpose: DIAGNOSTIC masking: NONE count: 90 type: ESTIMATED name: Point-of-care gastric ultrasound measure: Prevalence of full stomach measure: Frequency of changes to the anaesthetic plan measure: Calculated gastric content measure: Prevalence of solid gastric content measure: Association between fasting time for solids and 'full stomach' measure: Association between fasting time for liquids and 'full stomach' measure: Frequency of perioperative aspiration measure: Prevalence of gastric symptoms measure: Association between nausea and 'full stomach' measure: Association between vomiting and 'full stomach' measure: Association between dyspepsia and 'full stomach' measure: Association between abdominal distension and 'full stomach' measure: association between semaglutide dose and calculated gastric content measure: association between semaglutide dose and 'full stomach' measure: Association between frequency of semaglutide administration and calculated gastric content measure: Association between frequency of semaglutide administration and 'full stomach' measure: Association between duration of semaglutide therapy and calculated gastric content measure: Association between duration of semaglutide therapy at current dose and calculated gastric content measure: Association between duration of semaglutide therapy and 'full stomach' measure: Association between duration of semaglutide therapy at current dose and 'full stomach' measure: Association between duration of cessation of semaglutide and calculated gastric content measure: Association between duration of cessation of semaglutide and 'full stomach' measure: Association between preoperative blood glucose levels and calculated gastric content measure: Association between preoperative blood glucose levels and 'full stomach' measure: Association between HbA1c levels and calculated gastric content measure: Association between HbA1c levels and 'full stomach' measure: Association between time since onset of diabetes mellitus and calculated gastric content measure: Association between time since onset of diabetes mellitus and 'full stomach' sex: ALL minimumAge: 18 Years stdAges: ADULT stdAges: OLDER_ADULT facility: Antwerp University Hospital status: RECRUITING city: Edegem state: Antwerp zip: 2650 country: Belgium name: Nils Vlaeminck role: CONTACT phone: 038215865 email: nils.vlaeminck@uza.be name: Vera Saldien role: CONTACT phone: 038214788 email: vera.saldien@uza.be lat: 51.15662 lon: 4.44504 hasResults: False