Misplacement of left-sided double-lumen tubes into the right mainstem bronchus: incidence, risk factors and blind repositioning techniques

Table 2 Logistic regression analysis for right bronchial misplacement of left-sided double-lumen tubes

	Regression coefficient (SE)	Odds ratio (95 % CI)	P-value
Age	0.01 (0.01)	1.01 (0.99 to 1.04)	0.182
Female	1.33 (0.32)	3.78 (2.03 to 7.04)	<0.001
Height	−0.07 (0.02)	0.93 (0.89 to 0.97)	<0.001
Weight	−0.01 (0.01)	1.00 (0.97 to 1.03)	0.884
Laryngoscopic grade^a
2	−0.15 (0.48)	0.86 (0.34 to 2.22)	0.760
3	0.19 (0.74)	1.21 (0.28 to 5.21)	0.795
Double-lumen tube size^b
32-Fr	1.59 (0.37)	4.88 (2.35 to 10.17)	<0.001
35-Fr	0.88 (0.38)	2.42 (1.16 to 5.05)	0.018
RC distance	−0.08 (0.05)	0.93 (0.84 to 1.02)	0.136
LC distnace	−0.08 (0.05)	0.92 (0.83 to 1.02)	0.122
Tracheal diameter	−0.22 (0.06)	0.81 (0.71 to 0.91)	0.001
Right tracheobronchial angle (°)	0.10 (0.07)	1.01 (0.98 to 1.04)	0.456
Left tracheobronchial angle (°)	0.01 (0.08)	1.01 (0.98 to 1.04)	0.495
Right bronchial diameter (mm)	−0.21 (0.07)	0.81 (0.70 to 0.93)	0.003
Left bronchial diameter (mm)	−0.20 (0.08)	0.82 (0.70 to 0.97)	0.017

RC and LC distances: horizontal distances between the carina and the right or left internal borders of the trachea at 3 cm above the carina; Tracheal diameter: sum of the RC and LC distances
^aLaryngoscopic grade 1 and ^bSize of 37-Fr were considered as the reference value for the analysis

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