Weber U, Oguz R, Potura LA, Kimberger O, Kober A, Tschernko E. Anaesthesia 2011; 66(6): 481-487
In this crossover study, 50 adult patients with BMI 25-35kg/m2 were assigned to ventilation with the i-gel® and the LMA Unique® in random order. Insertion attempts, difficulty (on a scale of 1-4), time to insertion and leak pressure were measured with each device. Leak pressure was higher with the i-gel®, with a mean value of 23.7cm H2O compared to 17.4cm H2O with the LMA Unique®. Within the study population, there was a bigger difference in leak pressures amongst patients with BMI >30. Insertion was generally comparable, although the i-gel® had a significantly shorter insertion time.