Subcutaneous internal lateral sphincterotomy (SILS) versus nitroglycerine ointment in anal fissure: a prospective study.

AIM: To compare the results of subcutaneous internal lateral sphincterotomy under local anesthesia and nitroglycerin ointment treatments in acute and chronic anal fissures.

METHODS: This was a comparative, prospective study of 340 patients of acute and chronic anal fissure. The patients voluntarily opted either for the surgical procedure under local anesthesia, or the nitroglycerin treatment. All the patients were followed with regular checkups and complaints were documented.

RESULTS: Except for 1.75% patients having bleeding/hematoma formation, and with a dropout of 2.60% patients, no failure, recurrence or long term complications like incontinence, were observed in patients who underwent subcutaneous internal lateral sphincterotomy after a mean follow up of 28 months. With surgical treatment pain, bleeding per rectum and constipation showed significant improvement as compared to nitroglycerin treatment. Fissure healing was 100% in surgical group as compared to 56.90% in medical group (P=0.000, odds ratio=344.6). Nitroglycerin was equally effective in acute and chronic fissures (P=0.096).

CONCLUSION: Subcutaneous internal lateral sphincterotomy under local anesthesia is more curative, easy and safe, in the hands of a beginner as well as an experienced surgeon, with highest patient satisfaction, and should be considered as the first line of therapy in both chronic and resistant/recurrent acute anal fissures.