Case Control Study
Copyright ©The Author(s) 2021.
World J Clin Cases. Sep 16, 2021; 9(26): 7671-7681
Published online Sep 16, 2021. doi: 10.12998/wjcc.v9.i26.7671
Table 1 Patient characteristics

n (%)
Patients138
Male107 (77.5)
Age (mean ± SD, yr) 72.3 ± 10.5
PAD40 (29.0)
CBD diameter (mean ± SD, cm) 1.4 ± 0.6
CBD diameter ≥ 1.2 cm110 (79.7)
CBD diameter ≥ 1.5 cm73 (52.9)
Largest CBD stone diameter ≥ 1.2 cm68 (49.3)
CBD stone number ≥ 256 (40.6)
Muddy stones20 (14.5)
Initial ampullary intervention
EST8 (5.8)
EPBD/EPLBD79 (57.2)
ESBD28 (20.3)
CBD morphology
Straight type69 (50.0)
S type22 (15.9)
Polyline type47 (34.1)
Cholecystectomy8 (5.8)
Procedure time (mean ± SD, min)38.3 ± 19.5
Table 2 Characteristics of patients with and without common bile duct stone recurrence

Recurrence (n = 27)
Non-recurrence (n = 111)
P value
Sex (male/female) 21/686/250.97
Age (mean ± SD, yr) 71.9 ± 10.272.4 ± 10.60.82
PAD, n (%)12 (44.4)28 (25.2)0.05
CBD diameter (mean ± SD, cm) 1.5 ± 0.61.4 ± 0.40.29
CBD diameter ≥ 1.2 cm, n (%)27 (100.0)83 (74.8)< 0.01
CBD diameter ≥ 1.5 cm, n (%)23 (85.2)50 (45.0)< 0.01
Largest CBD stone diameter ≥ 1.2 cm, n (%)14 (51.9)54 (48.6)0.77
CBD stone number ≥ 2, n (%)13 (48.1)43 (38.7)0.37
Muddy stones, n (%)4 (14.8)16 (14.4)1.00
Initial ampullary intervention, n (%)
EST2 (7.4)6 (5.4)1.00
EPBD/EPLBD15 (55.6)64 (57.7)0.84
ESBD6 (22.2)22 (19.8)0.78
CBD morphology, n (%)< 0.01
Straight type4 (14.8) 65 (58.6)
S type12 (44.4) 10 (9.0)
Polyline type11 (40.7) 36 (32.4)
Cholecystectomy, n (%)3 (11.1)5 (4.5)0.39
Procedure time (mean ± SD, min)44.9 ± 22.736.7 ± 18.40.05
Table 3 Characteristics of patients with different common bile duct morphologies

Straight type (n = 69)
S type (n = 22)
Polyline type (n = 47)
P value
Sex (male/female) 49/2018/440/70.19
Age (mean ± SD, yr) 72.6 ± 10.971.8 ± 10.672.0 ± 10.00.93
PAD: n (%)20 (29.0)9 (40.9)11 (23.4)0.33
CBD diameter (mean ± SD, cm) 1.5 ± 0.51.8 ± 0.61.6 ± 0.5< 0.01
CBD diameter ≥ 1.2 cm, n (%)49 (71.0)22 (100.0)39 (83.0)< 0.01
CBD diameter ≥ 1.5 cm, n (%)32 (46.4)16 (72.7)25 (53.2)0.10
Largest CBD stone diameter ≥ 1.2 cm, n (%)32 (46.4)10 (45.5)26 (55.3)0.59
CBD stone number ≥ 2, n (%)27 (39.1)13 (59.1)16 (34.0)0.13
Muddy stones, n (%)12 (17.4)2 (9.1)6 (12.8)0.68
Initial ampullary intervention, n (%)
EST3 (4.3)2 (9.1)3 (6.4)0.62
EPBD/EPLBD39 (56.5)14 (63.6)26 (55.3)0.80
ESBD15 (21.7)3 (13.6)10 (21.3)0.78
Cholecystectomy, n (%)3 (4.3)2 (9.1)3 (6.4)0.62
Procedure time (mean ± SD, min)34.9 ± 15.749.1 ± 27.838.4 ± 18.60.07
Table 4 Characteristics of patients with single recurrence and multiple recurrences

Single recurrence (n = 20)
Multiple recurrences (n = 7)
P value
Sex (male/female) 15/56/11.00
Age (mean ± SD, yr) 72.7 ± 8.969.4 ± 13.80.48
PAD, n (%)11 (55.0)1 (14.3)0.09
CBD diameter (mean ± SD, cm) 1.9 ± 0.42.0 ± 0.80.73
CBD diameter ≥ 1.2 cm, n (%)20 (100.0)7 (100.0)
CBD diameter ≥ 1.5 cm, n (%)18 (90.0)5 (71.4)0.27
Largest CBD stone diameter ≥ 1.2 cm, n (%)9 (45.0)5 (71.4)0.39
CBD stone number ≥ 2, n (%)10 (50.0)3 (42.9)1.00
Muddy stones, n (%)4 (20.0)0 (0.0)0.55
Initial ampullary intervention, n (%)
EST2 (10.0)0 (0.0)1.00
EPBD/EPLBD11 (55.0)4 (57.1)1.00
ESBD4 (20.0)2 (28.6)0.63
CBD morphology, n (%)1.00
Straight type3 (15.0)1 (14.3)
S type9 (45.0)3 (42.9)
Polyline type8 (40.0)3 (42.9)
Cholecystectomy, n (%)3 (15.0)0 (0.0)0.55
Procedure time (mean ± SD, min)45.8 ± 17.042.4 ± 36.00.82
Follow-up period (mean ± SD, yr)19.0 ± 10.620.1 ± 7.70.80
Table 5 Risk factors for common bile duct stone recurrence
Factor
β
OR (95%CI)
P value
β
OR (95%CI)
P value
PAD0.551.74 (0.61-4.95)0.30
Procedure time0.011.01 (0.98-1.03)0.84
CBD diameter ≥ 1.5 cm1.826.15 (1.87-20.24)< 0.01
Model 1Model 2
CBD morphology< 0.01< 0.01
Straight typeReference-1.600.20 (0.06-0.70)0.01
S type2.8216.79 (4.27-66.09)< 0.011.223.38 (1.07-10.72)0.04
Polyline type1.604.97 (1.42-17.38)0.01Reference