| Minor complications |
|
| Grade I |
Adverse event which alters the standard postoperative course without requiring a specific treatment |
| Grade II |
Pharmacologic treatment or minor intervention required |
| Major complications |
|
| Grade IIIa |
Surgical, radiologic, endoscopic treatment, or multi-therapy required without general anesthesia |
| Grade IIIb |
Surgical, radiologic, endoscopic treatment, or multi-therapy required with general anesthesia |
| Grade IVa |
Intensive care unit treatment for single organ dysfunction required |
| Grade IVb |
Intensive care unit treatment for multiple organ dysfunction required |
| Mortality |
|
| Grade V |
Adverse event which leads to death |
