There are 2 generations of<unk>  devices
1st Gen = classic LMA, other standard LMAs
2nd Gen = iGel, LMA Supreme, Pro-Seal LMA (PLMA)
Second generation devices achieve improved esophageal and pharyngeal seal (causes ↑ oropharyngeal leak pressure), incorporate a "drain tube" that allows access to the esophagus and stomach, and usually have an incorporated bite block.
Oropharyngeal leak pressure = the applied pressure at which the seal between the device and the larynx begins to leak.
Peak inspiratory pressure needs to be less than the oropharyngeal leak pressure for effective ventilation and to prevent gastric insufflation.
Higher failure rate with obese patients, inappropriate patient position (e.g. trendelenberg), and placement by inexperienced provider
1st Gen = classic LMA, other standard LMAs
2nd Gen = iGel, LMA Supreme, Pro-Seal LMA (PLMA)
Peak inspiratory pressure needs to be less than the oropharyngeal leak pressure for effective ventilation and to prevent gastric insufflation.
Supraglottic airway
Oropharyngeal airway
Nasal foreign body
Pterygium
Ear foreign body
Subglottic stenosis
Epiglottitis
Ranula