Randomized single‐blind clinical trial of intradermal methylene blue on pain reduction after open diathermy haemorrhoidectomy

Perianal intradermal injection of methylene blue was useful in reducing the initial postoperative pain of open haemorrhoidectomy.

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	Year	Citations
Treatment of intractable pruritus ani Ernesto B. Eusebio, James Graham, Nat Mody Diseases of the Colon & Rectum Intractable Pruritus AniMethylene BlueMethylthionine ChlorideContact DermatitisClinical Dermatology	1990	80
Stapled Hemorrhoidopexy and Milligan Morgan Hemorrhoidectomy in the Cure of Fourth-Degree Hemorrhoids: Long-Term Evaluation and Clinical Results Claudio Mattana, Claudio Coco, Alberto Manno, Diseases of the Colon & Rectum	2007	77
Randomized clinical trial of 0·2 per cent glyceryl trinitrate ointment for wound healing and pain reduction after open diathermy haemorrhoidectomy K. K. Tan, K K Sng, K-H Tay, British journal of surgery	2006	47
Randomized clinical trial comparing LigaSure haemorrhoidectomy with open diathermy haemorrhoidectomy Kok‐Yang Tan, Thant Zin, Hyunsu Sim, Techniques in Coloproctology	2008	36

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