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Is transcutaneous electrical nerve stimulation an effective analgesia during colonoscopy?
Robinson R, Darlow S, Wright SJ, Watters C, Carr I, Gadsby G, Mayberry J
Postgraduate Medical Journal 2001 Jul;77(909):445-446
clinical trial
5/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: No; Blind subjects: No; Blind therapists: No; Blind assessors: Yes; Adequate follow-up: No; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVES: To evaluate the efficacy of transcutaneous electrical nerve stimulation (TENS) as analgesia during colonoscopy. DESIGN: In a randomised controlled trial, patients undergoing diagnostic colonoscopy were assigned to one of three groups: standard medication only (midazolam); active TENS plus standard medication; or non-functioning TENS and standard medication. Efficacy of TENS was determined using numerical rating scores for pain and the post-procedural evaluation questionnaire. SETTING: Patients undergoing diagnostic colonoscopy in a teaching hospital. MAIN OUTCOME: There was no statistically significant differences between the three groups. However in the active TENS group there was a greater variation in "physical discomfort" and "psychological distress", suggesting TENS may be effective in subgroup of patients.
Reproduced with permission from the BMJ Publishing Group.

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