Lateral internal sphincterotomy is an operation performed on the internal anal sphincter muscle for the treatment of chronic anal fissure. The internal anal sphincter is one of two muscles that comprise the anal sphincter which controls the passage of feces. The procedure helps by lowering the resting pressure of the internal anal sphincter, which improves blood supply to the fissure and allows faster healing.[1] The procedure has been shown to be very effective, with 96% of fissures healing at a median of 3 weeks in one trial.[2]
^Schubert MC, Sridhar S, Schade RR, Wexner SD (July 2009). "What every gastroenterologist needs to know about common anorectal disorders". World J. Gastroenterol. 15 (26): 3201–9. doi:10.3748/wjg.15.3201. PMC 2710774. PMID 19598294.
^Nyam DC, Pemberton JH (October 1999). "Long-term results of lateral internal sphincterotomy for chronic anal fissure with particular reference to incidence of fecal incontinence". Dis. Colon Rectum. 42 (10): 1306–10. doi:10.1007/BF02234220. PMID 10528769. S2CID 30099075.
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