Comparison of Two Methods for Bowel Preparation in Patients With Constipation

Comparison of Two Split-dose Regimes for Bowel Preparation in Patients With Constipation

Constipation is a common high risk factor for inadequate bowel preparation. The bowel cleansing efficacy of the standard split-does of 4L seems to be suboptimal in constipated patients. The investigator hypothesized that compared with the standard preparation regime, the split-dose with three times of 4L PEG may be superior in BP quality.

Inclusion Criteria:

• Patients aged 18-80 with constipation.

Exclusion Criteria:

• History of colorectal surgery BMI>30 Suspected colonic stricture or bowel obstruction Use of purgatives within 3 days Pregnancy or lactation Unable to give informed consent Haemodynamically unstable