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Table 3 Number of intubation attempts and subjective assessment of handling with direct laryngoscopy (DL), C-MAC3, C-MAC4, and C-MAC4/SBT videolaryngoscopy.

From: A randomised, controlled crossover comparison of the C-MAC videolaryngoscope with direct laryngoscopy in 150 patients during routine induction of anaesthesia

  DL C-MAC3 C-MAC4 C-MAC4/SBT
  (n = 150) (n = 150) (n = 50) (n = 100)
Number of intubation attempts    
1 48/50 (96%) 27/37 (73%) 14/18 (78%) 33/45 (73%)
2 2/50 (4%) 10/37 (27%) 3/18 (17%) 8/45 (18%)
3 0* 0 1/18 (5%) 4/45 (9%)
Subjective assessment of handling (C/L < 3 with DL)   
very good 85 (57%) 62 (41%) 12 (24%) 39 (39%)
good 49 (33%) 63 (42%) 34 (68%) 39 (39%)
poor 7 (5%) 16 (11%) 3 (6%) 14 (14%)
Subjective assessment of handling (C/L≥3 with DL)   
very good 0 (0%) 2 (1%) 0 (0%) 2 (2%)
good 5 (3%) 4 (2%) 1 (2%) 4 (4%)
poor 4 (2%) 3 (2%) 0 (0%) 2 (2%)
Common concerns    
comfort 6 (4%) 16 (11%) 2 (4%) 16 (16%)
guidance of laryngoscope handle 6 (4%) 13 (9%) 3 (6%) 14 (14%)
blade insertion 8 (5%) 12 (8%) 5 (10%) 9 (9%)
glottic exposure 26 (17%) 27 (18%) 8 (16%) 21 (21%)
  1. Data are given as absolute numbers (percentage). DL: Direct laryngoscopy. *Six patients that were originally ought to be intubated by DL showed limited glottic visualisation (C/L≥ 3) and had to be intubated with the C-MAC4 and straight blade technique.