Efficacy and safety of plastic and metal stents for endoscopic ultrasound guided-biliary drainage in elderly patients

Table 1 Patient characteristics, median (interquartile range)/n (%)

	PS group (n = 51)	MS group (n = 13)	P value
Age, years	78 (73-83)	79 (71-84)	0.79
Sex (male/female)	30/21	8/5	1.0
Performance status	0 (0-1.0)	0 (0-0.5)	0.49
Diseases (malignant/benign)	47/4	12/1	1.0
Pancreatic cancer	22	10
Biliary tract cancer	16	2
Duodenal cancer	2
Gastric cancer	2
Colon cancer	2
Urothelial cancer	1
Liposarcoma	1
Biliary tract stone	4
Cholecystitis	1
Benign biliary stricture		1
Target biliary part (distal/hilar)	41/10	12/1	0.44
Anamnesis	21 (41.2)	7 (53.8)	0.53
Cardiovascular diseases	13 (25.5)	3 (23.1)	1.0
Diabetes mellitus	5 (9.8)	4 (30.8)	0.07
Pulmonary diseases	3 (5.9)	0 (0)	1.0
Renal diseases	0 (0)	1 (7.7)	0.2
Past history of upper gastrointestinal surgery	9 (17.6)	1 (7.7)	0.67
Serum WBC count, (× 103/μL)	6.8 (5.0-8.7)	6.8 (4.9-9.3)	0.92
Serum CRP level, mg/L	3.2 (1.1-6.7)	5.1 (2.4-8.1)	0.33
Serum bilirubin level, mg/dL	4.9 (1.6-11.5)	5.9 (0.3-24.8)	0.97

WBC: White blood cell; CRP: C-reactive protein; PS: Plastic stent; MS: Metallic stent.

Table 2 Factors related to Endoscopic ultrasound-guided biliary drainage procedures, median (interquartile range)/n (%)

	PS group (n = 51)	MS group (n = 13)	P value
22 G needle use	30 (58.8)	1 (7.7)	< 0.01
Punctured organ (stomach/duodenum)	45/6	4/9	< 0.01
Dilator (mechanical/cautery/unknown)	50/0/1	7/6/0	< 0.01
Use of antegrade stenting	10 (19.6)	0 (0)	0.11
Procedural time, minutes	38.5 (25.8-60.0)	50.0 (41.8-59.8)	0.31
Adverse events	1 (2.0)	0 (0)	1.0
Bleeding	1
RBO	22 (43.1)	3 (23.1)	0.22
Reason for RBO
Debris	16	1
Dislocation	4	2
Blood clot	1
Overgrowth	1
Chemotherapy before RBO	21 (41.2)	4 (30.8)	0.54
Duodenal stent placement before RBO	11 (21.6)	3 (23.1)	1.0

G: Gauge; RBO: Recurrent biliary obstruction; PS: Plastic stent; MS: Metallic stent.