• Jun-Young Park, Jihion Yu, Jun Hyuk Hong, Jai-Hyun Hwang, and Young-Kug Kim.
• Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
• Acta Anaesthesiol Scand. 2021 Mar 1; 65 (3): 343-350.

BackgroundA laryngeal mask airway (LMA) is usually inserted by conventional 7 cm head elevation. However, little is known about the association of head elevation degree and LMA insertion. We hypothesized that 14 cm head elevation would increase the first attempt success rate of LMA Supreme insertion compared with conventional 7 cm head elevation in patients undergoing transurethral resection of bladder tumour.MethodsPatients were randomly allocated to the high group (n = 55, 14 cm head elevation) or the control group (n = 55, conventional 7 cm head elevation). The primary outcome was the first attempt success rate of LMA Supreme insertion.ResultsThe first attempt success rate was significantly higher in the high group than in the control group (53 [96.4%] vs 40 [72.7%], P = .001, relative risk = 1.30, 95% confidence interval [CI] = 1.12-1.57, absolute risk reduction = 23.7%). Fibreoptic bronchoscope grade 4 (ie optimal position of the LMA) was significantly higher in the high group (35 [64.8%] vs 18 [36.7%], P = .004, relative risk = 1.76, 95% CI = 1.16-2.68, absolute risk reduction = 30.9%).ConclusionsHead elevation of 14 cm height increased the first attempt success rate of LMA Supreme insertion and fibreoptic bronchoscopic grade in patients undergoing transurethral resection of bladder tumour. High head elevation can be an effective option for successful LMA Supreme insertion. Trial Registry Number: Clinicaltrials.gov (NCT04229862).© 2020 The Acta Anaesthesiologica Scandinavica Foundation. Published by John Wiley & Sons Ltd.

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