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

Table 4 Univariable Poisson regression of factors associated with arytenoid dislocation

Variable	IRR	95% CI	P-value
Patient characteristic
Age	0.974	0.951–0.997	0.026
Gender
Male	1.0
Female	2.912	1.335–7.280	0.012
ASA physical status
I	1.0
II	0.500	0.247–1.031	0.055
III	0.331	0.052–1.185	0.144
IV	0.000	0.000–0.000	0.986
Height	0.991	0.952–1.032	0.664
Body weight	1.002	0.972–1.030	0.914
Body mass index	1.013	0.921–1.107	0.781
Short neck	0.000	–	0.987
Mouth opening limitation	0.000	–	0.984
Anaesthetic factor
Cormack Lehane grade
1	1.0	–
2	0.592	–	0.280
3	0.000	–	0.986
4	0.000	–	0.998
Number of intubation attempts
1	1.0	–
2	1.111	–	0.917
3	0.000	–	0.987
4	0.000	–	0.996
Endotracheal tube ballooning	1.1525	0.046–3.796	0.984
Stylet use	0.818	0.017–1.370	0.843
BURP maneuver	0.295		0.229
Tracheal intubation tool
Conventional laryngoscope	1.0
Video–laryngoscope	0.000	–	0.987
Lightwand	0.000	–	0.998
Fiberoptic laryngoscopy	0.000	–	0.998
Esophageal stethoscope	0.768	0.274–3.205	0.663
Monitoring of neuromuscular blockade	0.537	0.227–1.139	0.126
Armoured tube	4.082	0.229–18.953	0.166
Tracheal intubation by 1^st-yr anesthesia resident (vs higher than 1^st resident and staff)	2.206	1.030–4.454	0.032
Surgical factor
Duration of surgery (min)
< 120	1.0
120–240	1.129	0.503–2.689	0.773
> 240	1.674	0.654–4.288	0.274
Pneumoperitoneum	0.472	0.176–1.067	0.096
^aPositions with head-neck movement (vs positions without head-neck movement)	2.925	1.439–5.803	0.002

^aHead-neck movement includes extension, flexion, rotation, and flexion-rotation. ASA American Society of Anesthesiologists, BURP backward upward rightward pressure, IRR incidence rate ratio, CI confidence interval

ISSN: 1471-2253