Table 2 Classification of complications

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