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Table 1 Classification of surgical complications

From: Clinical review: Can we predict which patients are at risk of complications following surgery?

Grade Description
1 Minor complication that can be easily treated on the ward with simple procedures or medications (for example, intravenous catheter, nasogastric tube, anti-emetic, simple analgesic)
2 Postoperative transfusion or treatment with medications other than those simple agents permitted under grade 1
3a Needing invasive therapy - either surgical, endoscopic or radiological without general anaesthesia
3b Needing invasive therapy - either surgical, endoscopic or radiological with general anaesthesia
4a Single-organ dysfunction requiring high-dependency unit/ICU admission
4b Multiorgan dysfunction requiring high-dependency unit/ICU admission
5 Death
Suffix 'd' Added if the patient is suffering from a complication at discharge
  1. Adapted from [11].