Table 2.

Algorithms for guidance endoscopic ultrasonography-guided biliary drainage

Ref.	Design	Proposed algorithm	No. of patients	Technical success rate	Complication rate
Park et al[35]	PS	“Enhanced guidewire manipulation protocol” EUS-RV/EUS-AS with guidewire manipulation protocol as a first-line In case of failure or duodenal invasion, transmural EUS-BD	45	91%	11%
Tyberg et al[20]	PS	“Patient anatomy” Dilated IHBT on cross-sectional imaging, received IHa Nondilated IHBT on cross-sectional imaging, received EHa In case of failure of IHa, conversion to an EHa	52	96%	10%

PS: Prospective study; EUS-RV: Endoscopic ultrasonography-guided rendez; EUS-AS: Endoscopic ultrasonography-guided antegrade stent placement; EUS-BD: Endoscopic ultrasonography-guided biliary drainage; IHBT: Intrahepatic biliary tree; IHa: Intrahepatic approach; EHa: Extrahepatic approach.