Image and intracavitary electrocardiogram-guided arm port placement in colorectal cancer: A retrospective comparative study

Table 2 Comparison of catheter tip position accuracy between groups, n (%)

Parameter	Experimental group (n = 103)	Control group (n = 113)	χ2 value	P value
Catheter tip position			9.743	0.002
Ideal position1	100 (97.6)	96 (85.4)	-	-
Position too high2	2 (1.9)	9 (8.0)	4.286	0.038
Position too low3	1 (0.5)	8 (6.6)	5.142	0.023
Secondary displacement at 1-month follow-up	1 (1.0)	6 (5.3)	3.227	0.045
Subgroup analysis of ideal position rate
Male patients	54/56 (96.4)	58/63 (92.1)	1.216	0.270
Female patients	46/47 (97.9)	38/50 (76.0)	10.372	< 0.001
BMI < 23 kg/m2	41/42 (97.6)	48/52 (92.3)	1.419	0.234
BMI ≥ 23 kg/m2	59/61 (96.7)	48/61 (78.7)	9.145	< 0.001

¹Ideal position defined as lower 1/3 of superior vena cava or cavo-atrial junction according to infusion nurses society guidelines.

²Position too high: Middle or upper 1/3 of superior vena cava.

³Position too low: Inside right atrium.

BMI: Body mass index.