Table 2. Grading of complication following the TM&M classification system.

Grading		Definition/treatment performed
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 multitherapy required without general anethesia
	Grade IIIb	Surgical, radiologic, endoscopic treatment, or multitherapy required with general anethesia
	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