After being informed about the study and potential risks, all patients (>18 years old scheduled for elective surgery under general anesthesia) giving written informed consent will undergo preoperative screening examination to determine eligibility for study entry. A randomization process has been previously done, according to which the participants have been classified into one of the four groups of the study. Each study group is scheduled to receive one of the four periglottic devices (LM FastrachTM, LM ProsealTM, LM I-GelTM, LM ProtectorTM) while evaluating the ventilation sufficiency and perfection of installation/ anatomical application to the larynx (evaluation with fiberscope).
The purpose of this study is to evaluate four, most popular periglottic airway devices as regards to ventilation sufficiency and perfection of installation/ anatomical application to the larynx (evaluation with fiberscope).