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. 2021 Apr 21;27(15):1643–1654. doi: 10.3748/wjg.v27.i15.1643

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©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/

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Research sample screening and grouping process. ¹Classification of acute pancreatitis 2012: revision of the Atlanta classification and definitions by international consensus. ²Report of the American-European Consensus conference on acute respiratory distress syndrome in 1994. Simplified standard: PaO₂/FiO₂ < 300 mmHg is defined as acute lung injury and PaO₂/FiO₂< 200 mmHg is defined as acute respiratory distress syndrome, and excludes cardiogenic pulmonary edema. Group A: PaO₂/FiO₂= 2; Group B: PaO₂/FiO₂> 2; Group C: PaO₂/FiO₂= 2; Group D: PaO₂/FiO₂> 2; ICU: Intensive care unit; SIRS: Systemic inflammatory response syndrome; MAP: Mild acute pancreatitis; MSAP: Moderately severe acute pancreatitis; SAP: Severe acute pancreatitis.