Table 3.

Stratification of other adverse event severity

Criteria	Severity
Various other unplanned events may occur as a result of a colonoscopy. These should be recorded, with appropriate details provided Categorisation of severity of adverse event (AE) is given below. Note that bleeding and perforation have their own categorisation (see separate tables) Every event should be recorded, even if it is deemed unlikely to have been caused by the procedure (see ‘Attribution of event’) Excludes admissions for social reasons
Procedure aborted (or not started) due to AE Unplanned post-procedure medical consultation Unplanned hospital admission, or prolonged hospital stay, for ≤3 nights Use of reversal agent Hypoxia (O2 saturations <85%) Hypotension (<90/50 mm Hg)	Minor
Unplanned admission or prolongation for 4–10 nights ITU admission for 1 night Interventional procedure (endoscopic or radiological) Interventional treatment for skin or other tissue injuries Unplanned ventilatory support during conscious sedation	Intermediate
Surgery for adverse event/sequelae Permanent disability Unplanned admission or prolongation for >10 nights ITU admission >1 night	Major
Death	Fatal

Taken from Rutter+Chilton,⁸⁸ in turn adapted from Cotton et al.⁸⁹

ITU, intensive therapy unit.