Angle of covered self-expandable metallic stents after placement is a risk factor for recurrent biliary obstruction

Table 2 Short- and long-term results, adverse events, cause of recurrent biliary obstruction, and reintervention

Classification		n (%)
		n = 87
Technical success		87 (100.0)
Functional success		72 (82.8)
Adverse event		9 (10.3)
	Pancreatitis	9 (10.3)
	Severe	1 (1.2)
	Moderate	5 (5.7)
	Mild	3 (3.4)
	Cholangitis	0 (0.0)
	Cholecystitis	0 (0.0)
	Other complications	0 (0.0)
		n = 18
RBO		18 (100.0)
	Sludge formation or food impaction	11 (61.1)
	Tumor overgrowth	5 (27.8)
	Migration	2 (11.1)
	Tumor ingrowth	0 (0.0)
Reintervention		18 (100.0)
	Metallic stent	9 (50.0)
	Sweep	5 (27.8)
	Plastic stent	3 (16.7)
	Not success	1 (5.5)

Other complications include bleeding, perforation, etc. RBO: Recurrent biliary obstruction; TRBO: Time to recurrent biliary obstruction; IQR: Interquartile range.