Table 1 The Clavien–Dindo classification^17,18

1

Any deviation from the postoperative course without the need for pharmacological treatment or surgical, radiological or endoscopic intervention. Acceptable therapeutic regimens are drugs as antiemetics, antipyretics, analgetic, diuretics, electrolytes and physiotherapy. This regimen also includes wounds opened at bedside

2

Requiring pharmacological treatment other than allowed for grade I. Blood transfusions, antibiotics and total parenteral nutrition are also included

3

Requiring surgical, endoscopic or radiological intervention

3a

Intervention under regional or local anesthesia

3b

Intervention under general anesthesia

4

Life-threatening complication requiring intensive care unit management

4a

Single-organ dysfunction

4b

Multi-organ dysfunction

5

Patient demise