Acute distal common bile duct angle is risk factor for post-endoscopic retrograde cholangiopancreatography pancreatitis in beginner endoscopist

Table 2 Result of endoscopic retrograde cholangiopancreatography between acute or obtuse angle in both group, n (%)

	Beginner endoscopist				Expert endoscopist
	Total (n = 69)	Acute angle (n = 37)	Obtuse angle (n = 32)	P value	Total (n = 69)	Acute angle (n = 36)	Obtuse angle (n = 33)	P value
Success rate	67 (97.1)	35 (94.6)	32 (100)	0.187	68 (98.6)	36 (100)	32 (97)	0.293
Cannulation time	5.5 ± 6.0	6.7 ± 7.2	4.1 ± 4.2	0.076	4.3 ± 2.9	4.2 ± 2.9	4.3 ± 2.9	0.833
Total procedure	19.6 ± 10.3	20.7 ± 11.2	18.3 ± 9.2	0.330	17.7 ± 7.5	16.8 ± 4.4	18.8 ± 9.9	0.296
P-duct insertion or injection	22 (31.9)	14 (37.8)	8 (25.0)	0.260	10 (17.4)	6 (22.2)	4 (12.1)	0.276
P-duct stent	19 (27.5)	12 (32.4)	7 (21.9)	0.335	7 (10.1)	4 (11.1)	3 (9.1)	0.785
PEP	9 (13.0)	8 (21.6)	1 (3.1)	0.023a	3 (4.3)	1 (2.8)	2 (6.1)	0.511
Hyperamylase-mia	12 (17.4)	6 (16.2)	6 (18.8)	0.786	12 (17.4)	6 (16.7)	6 (18.2)	0.868
Bleeding	2 (2.9)	1 (2.7)	1 (3.1)	0.918	1 (1.4)	0 (0)	1 (3.0)	0.293
Perforation	0 (0)	0 (0)	0 (0)	N/A	0 (0)	0 (0)	0 (0)	N/A

^aP < 0.05. PEP: Post-endoscopic retrograde cholangiopancreatography pancreatitis.