Management of Intersphincteric Fistula in Ano

Initial Assessment and Treatment

For patients with intersphincteric fistulas, the American Gastroenterological Association recommends fistulotomy as the treatment for subcutaneous or superficial tracts, while complex intersphincteric fistulas require loose seton placement followed by sphincter-sparing procedures such as LIFT when medical therapy has optimized inflammation 1
If an intersphincteric abscess is present, immediate drainage into the rectal lumen through the internal opening is required, with consideration of limited internal sphincterotomy to facilitate drainage, as suggested by the World Journal of Emergency Surgery 2
The European Society of Coloproctology recommends that timing of drainage should be based on sepsis severity: emergent drainage for patients with sepsis, immunosuppression, diabetes, or diffuse cellulitis; otherwise within 24 hours 3

The American Society of Colon and Rectal Surgeons recommends fistulotomy by laying open the tract with debridement for subcutaneous, superficial, or intersphincteric fistulas in the lower third of the anal sphincter 1
For fistulas involving significant sphincter muscle, the World Journal of Emergency Surgery recommends placing a loose draining seton initially to establish drainage and prevent abscess recurrence 3
After inflammation is controlled, the American Gastroenterological Association recommends proceeding with sphincter-sparing procedures such as LIFT 1

For patients with Crohn's disease, the European Crohn’s and Colitis Organisation recommends medical therapy to control disease-related inflammation before definitive surgical intervention 1
The American Gastroenterological Association recommends maintenance therapy with thiopurines, infliximab, or adalimumab, combined with seton drainage, after surgery for patients with Crohn's disease 1

The World Journal of Emergency Surgery recommends never probing for fistulas during acute abscess drainage to prevent iatrogenic complications 3
The American Society of Colon and Rectal Surgeons recommends avoiding surgical treatment of concomitant perianal skin tags in Crohn's patients, as this leads to chronic non-healing ulcers 1