Addition of senna improves colonoscopy preparation with lavage: a prospective randomized trial.

Attempts have been made to further improve the widely performed colonoscopy preparation with lavage. In a prospective study, 120 outpatients and inpatients scheduled for total colonoscopy were randomized to two preparatory regimens. The day before endoscopy either extractum sennae (N = 60) or a placebo solution (N = 60) was given. Just before examination all patients underwent whole gut irrigation with a polyethylene glycol electrolyte lavage solution (PEG-ELS). Adequacy of preparation, patient tolerance, and the necessary amount of PEG-ELS were assessed. Physician assessment of colon cleansing showed superiority in the group with additional laxative. The colon was free of solid debris in 66.7% of patients after PEG-ELS and in 90% after senna/PEG-ELS administration (p less than 0.01). Patient tolerance was similar in both groups with 86.7% vs. 83.3% of subjects rating the preparation as tolerable. Severe adverse events were not observed. In the senna/PEG-ELS group, significantly less (p less than 0.05) lavage fluid was needed. We conclude that the combination of senna and PEG-ELS is more effective than PEG-ELS in cleansing the colon for colonoscopy.