Glottic visualisation according to Cormack-Lehane score with direct laryngoscopy and C-MAC videolaryngoscopy. a) Best achievable Cormack-Lehane score (with external laryngeal manoeuvres, e.g. BURP) after direct laryngoscopy and C-MAC views in the DL, C-MAC3, C-MAC4, and C-MAC4/SBT groups, respectively. Data are given as percentage. C/L indicates Cormack and Lehane view, modified by Yentis and Lee;DL: Direct laryngoscopy. b) Improvement of Cormack-Lehane score in all patients with limited direct laryngoscopic view (DL group: C/L 3+4) after laryngoscopy with the C-MAC4/SBT (n = 8). Data are given as absolute numbers. C/L indicates Cormack and Lehane view, modified by Yentis and Lee;DL: Direct laryngoscopy.