Table 1.

Clavien classification of surgical complications

Clavien	Definition
I	Any deviation from the normal postoperative course without the need for pharmacologic/ surgical/ radiological intervention (antiemetics, analgesics, antipyretics, diuretics, electrolytes allowed)
II	Complication requiring pharmacological treatment
III	Complication requiring surgical/ endoscopic/ radiological intervention
IIIA	Intervention without general anaesthesia
IIIB	Intervention under general anaesthesia
IV	Life-threatening complication requiring ICU management
IVA	Single organ dysfunction
IVB	Multi-organ dysfunction
V	Patient mortality

ICU: intensive care unit. Adapted from Hasson HM. Am J Obstet Gynaecol 1971.⁷