Complex Anal Fistula When Initial Sphincter-Preserving Treatment Has Not Achieved Healing

Clinical Scenario

This protocol addresses patients with a complex or high anal fistula — specifically high transsphincteric, suprasphincteric, or extrasphincteric fistulas involving greater than 30% of the external anal sphincter; intersphincteric fistulas involving greater than 50% of the internal anal sphincter; or recurrent fistulas, including those with horseshoe or multiple extensions.

Previous Treatment & Unmet Goal

Initial management with a definitive sphincter-preserving approach — ligation of the intersphincteric fistula tract (LIFT), rectal advancement flap, or fistulotomy with immediate sphincter reconstruction (FISR) in selected patients — did not achieve the treatment goal of healing of the anal fistula. This protocol defines the next clinical step after that failure.

Salvage Approach — Partial Overview

When initial sphincter-preserving surgery has not achieved fistula healing, salvage and repeat sphincter-preserving strategies are available. The approach may involve repeat tract-targeted procedures or minimally invasive techniques suited to complex perianal anatomy, with the goal of healing of the anal fistula.

Full protocol — specific options, selection criteria, and sequencing — is available via the link below.

Instant Access to Structured Evidence-Based Regimens

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.
Although the LIFT procedure may not have healed the fistula, it succeeded in downstaging the fistula tract from transsphincteric to intersphincteric, which would qualify for a fistulotomy.
LAFT can be considered in patients with a high anal fistula.
Repeated LAFT can be considered in patients following primary failure from the first attempt.
VAAFT can be considered in the management of complex perianal fistula.
Fistula plug can be considered in the management of anal fistula.

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