The goal of this clinical trial is to compare the effects of nasopharyngeal and oropharyngeal airway on gastric insufflation in patients undergoing general anesthesia and expected difficult mask ventilation. The main questions it aims to answer are: * Is there a difference between the presence of gastric insufflation in the use of nasopharyngeal and oropharyngeal airways? * Is there a difference between the antral area sizes measured before and after ventilation After general anesthesia induction, nasopharyngeal or oropharyngeal airway will be placed in participants and real-time ultrasonographic gastric antral area imaging will be performed during mask ventilation. Researchers will compare the effects of nasopharyngeal and oropharyngeal airway use on gastric insufflation.
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Presence of gastric insufflation
Timeframe: During 2 minutes mask ventilation
Difference in antral area sizes
Timeframe: During 2 minutes mask ventilation