Biliary spontaneous dislodgement spiral stent for patients who underwent mechanical lithotripsy

Table 2 Clinical outcomes of the biliary spontaneous dislodgement spiral stent and nasobiliary tube groups, n (%)

	BSDSS group (n = 21)	Nasobiliary tube group (n = 28)	P value
Technical success	21 (100)	28 (100)	-
Overall post-ERCP adverse events	1 (4.8)	5 (17.9)	0.2194
Cholangitis	0 (0)	0 (0)	-
Pancreatitis1	1 (4.8)	1 (3.6)	1.0004
CBD stone recurrence	0 (0)	1 (3.6)	1.0004
Other events2	0 (0)	3 (10.7)	0.2504
Follow-up duration, median (IQR), mo	19 (17-22)	18 (15-21)	0.3655
Drainage time3, median (IQR), d	3 (3-5)	4 (2-5)	0.9345
Postoperative stay, median (IQR), d	4 (3-6)	5 (3-7)	0.2235

¹Pancreatitis was graded as mild in both groups;

²There was no biliary spontaneous dislodgement spiral stent (BSDSS) retention in the BSDSS group, while self-extraction (n = 2) and dislocation (n = 1) of the nasobiliary tube was noted in three patients in the nasobiliary tube group;

³Drainage time was defined as the duration from insertion to evacuation in the BSDSS group and the duration from insertion to extraction in the nasobiliary tube group;

⁴Fisher exact test;

⁵Mann-Whitney U-test. BSDSS: Biliary spontaneous dislodgement spiral stent; ERCP: Endoscopic retrograde cholangiopancreatography; CBD: Common bile duct; IQR: Interquartile range.