Transnasal endoscopic retrograde chalangiopancreatography using an ultrathin endoscope: A prospective comparison with a routine oral procedure

Table 3 Successful rates of cannulation and endoscopic naso-biliary drainage and rates of post-ERCP hyperamylasemia in each group

Groups	o-ERCP	n-ERCP	P-value
Successful cannulation (%)
Either of the ducts	25/25	23/25	0.510
	(100)	(92)
Common bile duct	24/25	18/25	0.053
	(96)	(72)
Pancreatic duct	24/25	21/23	0.940
	(96)	(91)
Median time for cannulation, min (%)	8	7	0.590
	(2-24)	(4-20)
Post-procedural hyperamylasemia (%)	7/25	5/23	0.870
	(28)	(22)
Successful ENBD (%)	20/21	13/15	0.340
	(95)	(87)

O-ERCP: Oral ERCP; n-ERCP: Nasal ERCP; ENBD: Endoscopic naso-biliary drainage.