Table 2: Classification of complications on the basis of modified Clavien-Dindo system [5].

Grade I: Any deviation from normal postoperative course without the need for pharmacological treatment or surgical, endoscopic or interventional radiology. The accepted therapies are drugs such as antiemetic, antipyretics, analgesics, diuretics, electrolytes and physiotherapy.
Grade II: Complication requiring pharmacological treatment with drugs other than those used in Grade I complication (including hematuria requiring blood transfusion)
Grade III: Complications requiring surgery, endoscopy or interventional radiology
Grade IIIa: Intervention carried out under any form of anesthesia other than general anesthesia (including performing a cystostomy)
Grade IIIb: Intervention performed under general anesthesia
Grade IV: Life-threatening complications (including central neurological complications)
Grade IVa: Dysfunction of a single organ. Including renal failure supported by dialysis
Grade IVb: Multiple organ dysfunction with Intensive Care Unit admission
Grade V: Death of the patient