Table 2.

Classification of complications

Grade	Definition
Grade 1	No need for drugs or surgery, endoscopy, or intervention
Grade 2	Requiring some treatment, including blood transfusions and parenteral nutrition
Grade 3	Requiring surgical, endoscopic, or radiological intervention
3a	Intervention not under general anesthesia
3b	Intervention under general anesthesia
Grade 4	Severe life-threatening complications need to be transferred to the intensive care unit or special care unit
4a	Single-organ dysfunction
4b	Multiorgan dysfunction
Grade 5	Resulting in death