Complex Anal Fistula When Sphincter-Preserving Salvage Treatment Has Not Achieved Healing
This protocol addresses the management of patients with complex or high anal fistula who have undergone salvage sphincter-preserving procedures — such as a repeat LIFT, laser ablation (LAFT), video-assisted anal fistula treatment (VAAFT), or a fistula plug — but whose fistula has not healed.
Clinical scenario
The patient has a complex anal fistula: high transsphincteric, suprasphincteric, or extrasphincteric fistula involving greater than 30% of the external anal sphincter; intersphincteric fistula involving greater than 50% of the internal anal sphincter; or a recurrent fistula, including those with horseshoe or multiple extensions. Fistulas of this type carry a meaningful risk of sphincter injury with further invasive approaches.
Why this protocol is reached
The previous treatment line — salvage or repeat sphincter-preserving procedures — did not achieve healing of the anal fistula. This protocol defines the structured approach taken once that goal has not been met and further sphincter-threatening surgery may not be appropriate or desired.
Next-line management — partial overview
The approach shifts to palliative intent. Management options at this stage centre on controlling symptoms and preventing progression rather than achieving fistula closure. The structured protocol details specific procedural and surgical options — including considerations based on patient preference, risk of incontinence, and severity of sepsis — and the criteria that guide selection between them.
References
DOI: 10.1111/codi.1674
- 'Complex' anal fistulas are extrasphincteric, suprasphincteric or high transsphincteric fistulas involving greater than 30% of the external anal sphincter (EAS) and intersphincteric fistulas involving greater than 50% of the IAS.
- Rectovaginal fistula, anterior fistula in women, recurrent fistula and fistulas with horseshoe or multiple extensions are also classified as complex fistulas.
- Loose setons can be considered as a long-term solution in patients who have complex, recurrent fistulas and are at risk of worsening incontinence from further invasive treatment.
- Loose setons can be considered as a long-term solution in patients who do not want to have further surgery.
- A palliative seton can be considered for the management of recurrent perianal sepsis.
- Palliative seton can be offered to patients with an anal fistula who are keen to avoid further surgical intervention and a risk of injury to the sphincter mechanism.
- A defunctioning stoma can be considered in patients with severe and locally uncontrollable perianal sepsis with an anal fistula.
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