Related Experiment Video
Updated: Oct 10, 2025
A New Ex Vivo Model for the Evaluation of Endoscopic Submucosal Injection Material Performance
Published on: October 19, 2018
Impact of including epinephrine in the submucosal injectate for colorectal EMR on postprocedural pain: a randomized
Douglas K Rex1, Rachel E Lahr1, Merritt M Peterson1
1Division of Gastroenterology/Hepatology, Indiana University School of Medicine, Indianapolis, Indiana, USA.
Background And Aims:
EMR is first-line therapy for colorectal laterally spreading lesions. Some colonoscopists include epinephrine in the submucosal injectate, which we observed increased postprocedure discomfort. Our aim was to determine whether inclusion of epinephrine in the submucosal injectate increases postprocedure pain after EMR.
Methods:
We performed a randomized, controlled, double-blind trial comparing epinephrine in submucosal injectate versus injectate alone for abdominal pain at 30 and 60 minutes after EMR.
Results:
Mean polyp diameter in both arms was >40 mm. There were no differences in procedure times or amounts of fluid injected. Mean pain was higher on a visual analog scale in the epinephrine group at 30 minutes (47 vs 14, P = .022) and at 60 minutes (44 vs 13, P = .035). Recovery room stay was longer in the epinephrine group (68 vs 53 minutes, P = .034).
Conclusions:
Epinephrine in the submucosal injectate for EMR increases postprocedural pain, which could cause diagnostic confusion and prolong observation time in the recovery area. (Clinical trial registration number: NCT04065451.).
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