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).