The optimal bowel preparation intervals before colonoscopy: A randomized study comparing polyethylene glycol and...

Area of Science:

• Gastroenterology
• Endoscopy
• Clinical Trials

Background:

• Previous research on optimal bowel preparation duration focused solely on polyethylene glycol (PEG).
• The efficacy and timing of newer bowel preparation agents require investigation.

Purpose of the Study:

• To determine optimal intervals for satisfactory bowel preparation quality and tolerability using PEG/ascorbic acid (PEGA) and sodium picosulphate/magnesium citrate (SPMC).
• To compare these intervals with those of 4L polyethylene glycol (PEG).

Main Methods:

• A randomized, multicenter, endoscopist-blinded study involving 612 outpatients.
• Patients received bowel preparation with PEG, SPMC, or PEGA.
• Assessment included preparation quality, tolerability, duration, and time to colonoscopy.

Main Results:

• Optimal preparation duration was similar for PEG and SPMC (≥8.4 hours).
• The optimal interval to colonoscopy was ≤11.8 hours, consistent across all preparations.
• Preparation duration and timing were the sole predictors of satisfactory preparation; tolerability varied by product (SPMC).

Conclusions:

• Optimal bowel preparation intervals are consistent across PEG, PEGA, and SPMC.
• Satisfactory colonoscopy preparation is achieved with a preparation duration of ≥8.4 hours and completion within ≤11.8 hours before the procedure.