Comparison in Difficult Airway Scenario Induced in Patients With Laryngeal Mask Airway (LMA)-Classic™, LMA™ - Flexible and LMA - Proseal™

Supraglottic airway tools, one of the tools used in the management of the difficult airway. American Society of Anesthesiologists and the Difficult Airway Society of the United Kingdom airway management algorithms have included the LMA. In our study investigators aimed to determine which one will show the best performance with supraglottic airway means that LMA - Classic, LMA - Flexible and LMA - ProSeal in patients that difficult airway scenarios created with attaching collar.

Inclusion Criteria:

• Without a history of difficult intubation, supine position, does not require tracheal intubation, undergo elective surgery

Exclusion Criteria:

• High aspiration risk, who take more than 4 hours surgery
• Body mass index greater than of 35 kg/m²
• Disease related to the cervical spine
• The mouth opening is less than 20 mm