Management of Fecal Fistula

Initial Stabilization

The American College of Surgeons recommends aggressive IV fluid resuscitation with normal saline (2-4 L/day) for high-output fistulae (>500 ml/day) to prevent severe dehydration and electrolyte depletion 1, 3
Monitor and replace ongoing losses continuously, with particular attention to sodium replacement 3
Restrict hypotonic/hypertonic fluids to <1000 ml daily in high-output fistulae 3
The World Journal of Emergency Surgery notes that the greater the output, the higher the difficulty in managing the fistula 4

Classify fistulae by output: low output (<200 ml/day), moderate output (200-500 ml/day), and high output (>500 ml/day) 1, 4

Treat intra-abdominal abscesses with IV antibiotics and radiological drainage as first-line therapy 1, 3
Never initiate anti-TNF therapy before adequate abscess drainage, as this worsens sepsis and increases mortality 1, 2, 3

Reserve parenteral nutrition (TPN) for proximal or high-output fistulae where enteral nutrition is not tolerated 3
Initiate enteral nutrition for distal or low-output fistulae as soon as possible 2
Caloric intake and protein demands are increased in the presence of fistulae; evaluate and correct nitrogen balance and supplement protein 4

Protect skin from fistula output to preserve peri-wound skin integrity 1
Effluent isolation is essential for proper wound healing 4
Negative Pressure Wound Therapy (NPWT) makes effluent isolation feasible and wound healing achievable in the presence of fistulae 1, 4

Initiate anti-TNF therapy only after sepsis control and abscess drainage for fistulae associated with active Crohn's inflammation 3
Anti-TNF therapy achieves fistula healing in only one-third of patients, with half of responders experiencing relapse over 3 years 3

High-output fistulae (>500 ml/day) cannot be controlled medically and require surgery 2, 3
Fistulae associated with bowel stricture and/or abscess require surgical intervention 1, 2, 3
Delay surgery for 3-12 months after initial diagnosis or previous laparotomy to allow lysis of fibrous adhesions and improve outcomes 2, 3

All patients with enterocutaneous fistulae must be managed by a multidisciplinary team given the complexity and association with adverse outcomes including mortality 3