2.1 Search Strategy
Electronic databases which including PubMed, Cochrane Library, Scopus, Embase, Web of Science, China National Knowledge Infrastructure(CNKI) and Wan fang database were searched. These following keywords were used individually or in a combined manner for the online literature: Continuous Renal Replacement Therapy OR Continuous RRT OR Continuous Renal Replacement Therapy OR Continuous Venovenous Hemodiafiltration OR CVVHDF OR Continuous Veno-Venous Hemodiafiltration OR Slow Continuous Ultrafiltration OR SCUF Technique OR CVVH Technique OR Continuous Veno-Venous Hemofiltration OR CAVHD OR Continuous Venovenous Hemodialysis OR CVVHD OR Continuous Veno-Venous Hemodialysis AND Acute Pancreatitis OR Acute Edematous Pancreatitides. Two reviewers (SJ Ma and MM Zhao) independently review the titles, keywords, and abstracts of the literature selected in these format, when they encounter differences of opinion, they discussed with the third reviewer(ZY Pan) then made arbitration and decision.