Use of New Supraglottic Airway Devices in Severely Obese Patients: A Feasibility Study

Inclusion Criteria: * Scheduled for elective surgery with an estimated duration of 30 to 120 minutes * American Society of Anesthesiologists (ASA) status I-III * Aged 18 to 65 years. * Body mass index (BMI) ≥ 35 kg/m2 Exclusion Criteria: * A history of difficult intubation; * Immobilized cervical spine; * Oxygen saturation less than 95% at room air; * A history of uncontrolled gastroesophageal reflux or hiatus hernia; * A history of ulcer surgery including vagotomy; * Previous gastric bypass surgery; * Diabetic gastroparesis; * Patients with known coagulation disorders (e.g. hemophilias, von Willebrand disease, factor V leiden diseases) or on systemic anticoagulation drugs (e.g. continuous heparin infusion); Patients with abnormal coagulation tests will be also excluded. However, asymptomatic patients will not be tested on any coagulation disorders. * Any pathologies of the mouth, pharynx or larynx, the access to the airway is restricted, or a difficult tracheal intubation is anticipated. * Pregnant or breast-feeding (pregnancy status will be confirmed by a pregnancy test, as it is standard for all surgical procedures at the University hospital).