How we can measure quality in colonoscopy?

Table 2 Groups of patients in whom polyethylene glycol bowel-preparation is considered as safer and thus should be preferred

Candidates for polyethylene glycol bowel preparation for colonoscopy
1GFR < 60 mL/min per 1.73 m2
Electrolyte imbalance
Cardiac failure
Liver cirrhosis
Hypertension with arteriosclerosis
Patients on diuretics
(when cannot be stopped 24 h prior to colonoscopy)
Patients on ACE inhibitors
(when cannot be stopped 72 h prior to colonoscopy)
Patients on NSAIDs
(when cannot be stopped 72 h prior to colonoscopy)

¹Estimated glomular filtration rate (GFR) from serum creatinine concentration. NSAIDs: Nonsteroidal antiinflammatory drugs; ACE: Angiotensin-converting enzyme.