Controlled mechanical ventilation with LMA Sureme versus i-gel in anesthetized adult patients.

The efficacy, safety and ease of insertion of LMA Supreme and the i-gel in adult cases undergoing elective surgical procedures requiring general anesthesia with controlled mechanical ventilation. This study included 60 ASA physical status I-II adult patients of both sexes scheduled for elective surgical procedures under general anesthesia. Patients were randomly allocated into one of two groups; LMA-S GI (n=30) and i-gel GII (n=30). A size 4 LMA Supreme and a size 4 i-gel were used with standard monitoring. Number of insertion attempts, ease of insertion, presence of gastric insufflation, laryngeal leak, leak pressure, ease of gastric tube insertion, ventilatory parameters, complications as well as hemodynamic variables was recorded. The results showed no clinically significant changes of heart rate, MAP, SpO2 or P(ET)CO2 in GI & GII. The i-gel showed higher frequency of ease of insertion (p=0.048) and gastric tube (p< 0.001). First attempt of insertion was successful in 60% of LMA-S GI and 73.3% of the i-gel GII (p=0.460) without failures in both groups. Leak pressure was significantly higher in the i-gel (25.5 +/- 4.8 cm H2O) compared to the LMA-S (21.1 +/- 7.6 cm H2O) (p=0.010) while both peak and plateau pressures were significantly lower in i-gel GI (19.35 +/- 2.25 cm H2O & 17.75 +/- 2.07 cm H2O) compared to LMA-S GII (30.05 +/- 3.82 cm H2O & 28.80 +/- 3.99cm H2O) (p<0.001) respectively. There was no significant difference between both groups in the frequency of complications encountered during insertion or recovery.