Efficacy of laparoscopic low anterior resection for colorectal cancer patients with 3D-vascular reconstruction for left coronary artery preservation

Table 1 Baseline data of included patients [mean ± SD, n (%)]

Clinical features	3D vascular reconstruction group (n = 72)	Non-3D vascular reconstruction group (n = 74)	t value	P value
Gender			0.219	0.64
Male	47 (65.3)	51 (68.9)
Female	25 (34.7)	23 (31.1)
Age (year)	59.75 ± 6.2	58.77 ± 6.1	0.961	0.338
BMI (kg/m2)	24.1 ± 2.2	23.6 ± 2.7	1.123	0.263
Neoadjuvant therapy	12 (16.7)	13 (17.6)	0.021	0.885
ASA score			0.174	0.917
ASA I	24 (33.3.0)	23 (31.3)
ASA II	37 (51.4)	38 (51.4)
ASA III	11 (15.3)	13 (17.6)

BMI: Body mass index; ASA: American Society of Anesthesiology.

Table 2 Submesenteric artery branch types [n (%)]

Arterial classification	3D vascular reconstruction group (n = 72)	Non-3D vascular reconstruction group (n = 74)	χ2	P value
Branch type			0.092	0.993
Type I	35 (48.6)	37 (50.0)
Type II	25 (34.7)	24 (32.4)
Type III	11 (15.3)	12 (16.2)
Type IV	1 (1.4)	1 (1.4)

Table 3 Data analysis of surgery and complications (mean ± SD)

Intraoperative and postoperative indicators	3D vascular reconstruction group (n = 72)	Non-3D vascular reconstruction group (n = 74)	χ2	P value
Operation time (min)	162.2 ± 10.8	197.9 ± 19.1	-13.84	0.001
Conversion to laparotomy	0	0
Intraoperative blood loss (mL)	30.4 ± 20.0	61.2 ± 26.4	-7.93	0.001
Anastomotic leak	1 (1.4%)	1 (1.4%)	0.001	0.984
Anastomotic hemorrhage	2 (2.8%)	3 (4.1%)	0.18	0.672
Postoperative hospital stay	6.8 ± 0.7	7.0 ± 0.7	1.48	0.141

Table 4 Postoperative pathological results [mean ± SD, n (%)]

Pathological index	3D vascular reconstruction group (n = 72)	Non-3D vascular reconstruction group (n = 74)	χ2	P value
Tumor size (cm)	3.1 ± 0.8	2.9 ± 0.9	1.309	0.193
Number of lymph nodes	18.3 ± 2.7	17.6 ± 2.1	1.72	0.088
Degree of differentiation			0.085	0.958
Low	20 (27.8)	19 (25.7)
Middle	39 (54.2)	41 (55.4)
High	13 (18.1)	14 (18.9)
Pathological stage			0.248	0.883
Stage I	14 (19.4)	13 (17.6)
Stage II	35 (48.6)	39 (52.7)
Stage III	23 (31.9)	22 (29.7)