Comparative evaluation of sevoflurane, propofol, and combination of sevoflurane and propofol on insertion characteristics of reusable classic laryngeal mask airway

Adequate depth of anaesthesia is needed for successful placement LMA. under lighter plane of anaesthesia inadequate mouth opening,coughing,body movements can lead to rejection of LMA and may be associated with breath holding and bronchospasm. Use of propofol in doses which allow adequqate jaw relaxation and prevent patient reaction to LMA commonly results in hypotension and prolonged apnoea. Apart from minimal respiratory irritant properties sevoflurane as compared to propofol has the advantage of providing better hemodynamic stability and a smoother transition to the maintainance phase without a period of apnea. However sevoflurane is associated with delayed jaw relaxation and a longer time for the insertion of the LMA.Our hypothesis is that induction of anaesthesia with the combination of sevoflurane and small dose of propofol may optimize the insertion conditions of LMA and decrease the side effects of individual drugs.