Comparison of the BASKA Airway, a Novel Supraglottic Device, to the LMA Airway in Low Risk Female Patients

The investigators have performed a number of studies on novel airway devices, including an observational study on the performance of a new supraglottic airway named Baska mask. In this new proposed study the investigators would like to compare directly,in a randomized clinical trial, this device with the device the investigators routinely use - the single use laryngeal mask airway - LMA, in female patients undergoing general anaesthesia. This study will determine which device performs best, as measured by key parameters (insertion success rate, seal pressures, time to and ease of insertion, failure rate, complications etc) as regarding the performance and safety profile of the Baska mask and the LMA. The investigators have two study hypotheses, namely (1) non-inferiority of first placement attempt success rate of Baska vs LMA; and (2) greater seal pressure of the Baska mask vs LMA. A number of secondary endpoints will be monitored and analyzed (time to and ease of insertion, failure rate, complications etc).