不同头颈位对LMA-SupremeTM间歇正压通气时口咽漏气压的影响

目的评价不同头颈位对LMA-SupremeTM(SLMA)间歇正压通气时口咽漏气压(OLP)的影响。方法妇科全麻手术患者60例,麻醉诱导后插入SLMA行间歇正压通气,设定喉罩气囊压(ICP)为60 cm H2O。喉罩插入即刻,机械通气后60 min分别测量正中位、前屈位、旋转位、后仰位四个头颈位时的OLP和ICP。统计各头颈位正压通气时漏气率。分别在四个头颈位通过引流管插入润滑后的胃管,记录胃管插入成功率并经通气导管插入纤维支气管镜(FOB),采用FOB分级法评价喉罩解剖位置。结果喉罩置入即刻和机械通气后60 min的OLP,前屈位>正中位>后仰位,旋转位与正中位比较无明显差异(P<0.05)。ICP在前屈位大于正中位,后仰位小于正中位,旋转位与正中位比较无明显差异。各种头颈位下患者喉罩解剖位置FOB分级无差异;前屈位时胃管插入成功率低于其他头颈位。结论头前屈位可改善SLMA气道密闭性,适度前屈患者头部是改善SLMA正压通气效果的有效方法。相对于正中位,旋转位不影响SLMA通气效果,而后仰位降低SLMA气道密闭性。

Influence of head and neck position on oropharyngeal leak pressure with LMA-Supreme~(TM) during intermittent positive pressure ventilation

Objective To evaluate the influence of head and neck position on oropharyngeal leak pressure with LMA-SupremeTM during intermittent positive pressure ventilation.Methods Sixty anaesthetized adult female patients were studied.The laryngeal mask airway was inserted into each patient and the cuff was inflated to an intra-cuff pressure(ICP)of 60cm H2O.The oropharyngeal leak pressure(OLP),intra-cuff pressure,and leakage rate were determined at four different head and neck position(neutral,flexion,rotation and ex...