Metterlein T, Dintenfelder A, Plank C, Graf B, Roth G. Rev Bras Anestesiol. 2017 Mar - Apr;67(2):166-171
Random assignment of 52 adult patients to different supraglottic devices, from: Laryngeal Tube, LMA, i-gel, LMA Unique, LMA Supreme and Aura-once. After successful ventilation, device positioning was examined to assess glottic opening. Glottic view ranged from 40% for Laryngeal Tube to 90%, with i-gel recording 70%.
Link to abstract.
Cuvas Apan O, Apan A. Rev Bras Anestesiol. 2016;66(2):171-5
270 patients aged 0-12 years not requiring tracheal intubation were recruited. After induction, thenar eminence dimensions were measured and compared with the patient's inserted i-gel. Authors conclude their results showed that the dimensions of thenar eminence fitted the weight-based size selection of i-gel, and that it could be a practical way to choose the correct size device.
Link to abstract