SummaryIn a randomised, non-crossover study, we tested the hypothesis that the ease of insertion using a duodenal tube guided insertion technique and the oropharyngeal leak pressure differ between the LMA ProSeal TM and the i-gel TM in non-paralysed, anesthetised female subjects. One hundred and fifty-two females aged 19-70 years were studied. Insertion success rate, insertion time and oropharyngeal leak pressure were measured. First attempt and overall insertion success were similar (LMA ProSeal, 75 ⁄ 76 (99%) and 76 ⁄ 76 (100%); i-gel 73 ⁄ 75 (97%) and 75 (100%), respectively). Mean (SD) insertion times were similar (LMA ProSeal, 40 (16) s; i-gel 43 (21) s). Mean oropharyngeal leak pressure was 7 cmH 2 O higher with the LMA ProSeal (p < 0.0001). Insertion of the LMA ProSeal and i-gel is similarly easy using a duodenal tube guided technique, but the LMA ProSeal forms a more effective seal for ventilation. [6]. In the following randomised, non-crossover study, we tested the hypothesis that the ease of guided insertion and the oropharyngeal leak pressure differ between the LMA ProSeal and the i-gel in non-paralysed, anaesthetised females. MethodsEthical Committee approval and written informed consent were obtained. One hundred and fifty-two consecutive female patients (ASA physical status grade 1-2, aged 19-70 years) undergoing elective gynaecological or orthopaedic surgery in the supine position were studied. Patients were randomly assigned to have either the LMA ProSeal (n = 76) or i-gel (n = 76) for airway management. Randomisation was by thoroughly mixing 152 opaque sealed envelopes, each containing the name of a device on an identical sheet of inwardly folded paper. The device was assigned by opening a randomly selected envelope. Patients were excluded if they were < 19 years old, had a known or predicted difficult airway, a body mass index > 35 kg.m )2 , or were at risk of aspiration. All cases were conducted by one of five anaesthetists with substantial experience of both devices using non-guided techniques (75-500 uses) but limited experience of using a guided technique (5-10 uses).
We conclude that oropharyngeal leak pressure and fiberoptic position of the airway tube are similar for the size 2 LMA ProSeal(TM) and i-Gel(TM) in non-paralysed ventilated children.
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