Comparison of the accuracy of three methods measured the length of the right main stem bronchus by chest computed tomography as a guide to the use of right sided double-lumen tube

Table 2 Position of the endobronchial cuff of RDLT at initial placement and after turning the patients to the lateral decubitus position

Time of evaluation	Score of endobronchial cuff position	C-P(n = 56)	C-D(n = 56)	C-C(n = 56)	p
Time of evaluation	Score of endobronchial cuff position	CP ≥ 14 mm	CD ≥ 20 mm	CC ≥ 24 mm	p
Initial placement (n, %)	1	27(48)	35(62)^ab	19(34)	< 0.01
	2	18(32)	20(36)	23(41)
	3	10(18)	1(2)	14(25)
	4	1(2)	0(0)	0(0)
Lateral position (n, %)	1	21(37.5)	21(37.5)^ab	9(16)	< 0.01
	2	24(43)	33(59)	30(54)
	3	7(12.5)	2(3.5)	14(25)
	4	4(7)	0(0)	3(5)

The score of endobronchial cuff position (1 = invisible, 2 = visible, not herniated, 3 = slight herniation, ventilation maintained, 4 = herniation, inadequate ventilation); CP Carina-proximal distance, CD Carina to distal distance, CC Carina to carina distance
^aP < 0.05 compared with C-P group; ^bP < 0.05 compared with C-C group

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