Modified Clavien Classification

Grade I     Any deviation from the normal postoperative course without the need for treatment

Grade II      Requiring pharmacological treatment with drugs. Blood transfusions and total parenteral nutrition are also included

Grade III     Requiring surgical, endoscopic or radiological intervention

Grade IIIa   Intervention not under general anesthesia

Grade IIIb    Intervention under general anesthesia Grade IV Life-threatening complication requiring IC/ICU management

Grade IVa    Single organ dysfunction (including dialysis)

Grade IVb Multiorgan dysfunction

Grade V Death of a patient