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Table 2 Anesthetic factors associated with arytenoid dislocation

From: Head-neck movement may predispose to the development of arytenoid dislocation in the intubated patient: a 5-year retrospective single-center study

Variable Non-dislocation (n = 25,505) Dislocation (n = 33) P-value
Cormack Lehane grade      0.462
 1 18,832 (73.8%) 28 (84.8%)  
 2 5684 (22.3%) 5 (15.2%)  
 3 973 (3.8%) 0 (0%)  
 4 16 (0.1%) 0 (0%)  
Number of intubation attempts      0.999
 1 24,794 (97.2%) 32 (97.0%)  
 2 697 (2.7%) 1 (3.0%)  
 3 13 (0.1%) 0 (0%)  
 4 1 (0%) 0 (0%)  
Stylet use 939 (3.7%) 1 (3.0%) 1.000
BURP maneuver 2445 (9.6%) 1 (3.0%) 0.326
Tracheal intubation tool
 Conventional laryngoscope 25,077 (98.3%) 33 (100.0%) 0.967
 Video-laryngoscope 327 (1.3%) 0 (0%)  
 Lightwand 83 (0.3%) 0 (0%)  
 Fiberoptic laryngoscope 18 (0%) 0 (0%)  
Endotracheal tube ballooning 25,413 (99.6%) 33 (100%) 1.000
Esophageal stethoscope 23,686 (92.9%) 30 (90.9%) 0.921
Neuromuscular monitoring 9531 (37.4%) 8 (24.2%) 0.169
Armoured tube 193 (0.8%) 1 (3.0%) 0.617
Endotracheal tube size (ID, mm)      0.237
  < 6 14 (0%) 0 (0%)  
 6 202 (0.8%) 1 (3.0%)  
 6.5 260 (1.0%) 1 (3.0%)  
 7 14,526 (57.0%) 26 (78.8%)  
 7.5 66 (0.3%) 0 (0%)  
 8 10,434 (40.9%) 5 (15.2%)  
 8.5 2 (0%) 0 (0%)  
 9 1 (0%) 0 (0%)  
Tracheal intubation by 1st-yr anaesthesia residents 4707 (18.5%) 11 (33.3%) 0.048
  1. Data are presented as number (%). ID internal diameter, BURP backward upward rightward pressure