Evaluation of head and neck position on oropharyngeal leak pressure with baska mask and streamlined liner of pharyngeal airway (SLIPATM): a randomize

INTERVENTION: baska mask slipa CONDITION: ; supraglotic devices ,baska mask ,slipa supraglotic devices ,baska mask ,slipa PRIMARY OUTCOME: compare the oropharyngeal leak pressures of streamlined liner of pharyngeal airway (SLIPATM) and the Baska mask at different head and neck positions SECONDARY OUTCOME: assess and compare the fiberoptic view of glottis, ventilator score and incidence of complication of both devices in different head and neck positions INCLUSION CRITERIA: ASA physical status I‐II, 18‐60 years of age either sex scheduled for short duration(<3 hr) ambulatory surgery.