Enterocutaneous fistula

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Enterocutaneous fistula



Synonyms ECF, intestinal cutaneous fistula, bowel-to-skin fistula, gastrointestinal cutaneous fistula
Pronunciation en-ter-oh-kyoo-TAY-nee-us FIS-choo-luh
Specialty Gastroenterology, general surgery, colorectal surgery, wound care
Symptoms Drainage of intestinal fluid, bile, mucus, gas, or stool through the skin; abdominal pain; skin irritation; fever; dehydration; weight loss
Complications Sepsis, abscess, malnutrition, dehydration, electrolyte imbalance, skin breakdown, anemia, recurrent infection, prolonged hospitalization




Causes Abdominal surgery, bowel injury, Crohn's disease, malignancy, radiation injury, trauma, infection, ischemia, anastomotic leak


Diagnosis Clinical examination, fistula output assessment, blood tests, wound evaluation, computed tomography, contrast studies, fistulography, endoscopy when indicated



Treatment Fluid and electrolyte correction, sepsis control, drainage of abscesses, wound and skin protection, nutritional support, output control, and surgery if the fistula does not close or complications persist
Medication Antibiotics when infection or sepsis is present; acid suppression, antimotility agents, or antisecretory therapy in selected patients
Prognosis Depends on cause, fistula output, anatomy, sepsis, nutritional status, and associated disease




Enterocutaneous fistula is an abnormal connection between the gastrointestinal tract and the skin. It allows intestinal contents such as digestive fluid, bile, mucus, gas, or stool to pass through an opening in the abdominal wall. An enterocutaneous fistula is often abbreviated as ECF.

This condition can be distressing and medically serious because the ongoing loss of intestinal fluid can lead to dehydration, electrolyte imbalance, malnutrition, infection, and sepsis. Prompt diagnosis, careful wound care, nutritional support, and appropriate surgical or nonsurgical management are important for improving patient outcomes.

Overview[edit]

An enterocutaneous fistula forms when a portion of the stomach, small intestine, or large intestine communicates abnormally with the skin surface. The opening on the skin may drain fluid continuously or intermittently. The amount and type of drainage depend on the location of the fistula in the gastrointestinal tract.

Enterocutaneous fistulas are among the more complex problems in gastrointestinal surgery and wound care. They may occur after abdominal operations, especially when there is a leak from a bowel connection known as an anastomosis. They can also occur in people with inflammatory bowel disease, especially Crohn's disease, or in association with cancer, radiation therapy, trauma, infection, or bowel ischemia.

Definition[edit]

An enterocutaneous fistula is a pathologic tract connecting the lumen of the gastrointestinal tract to the skin. The word can be broken down as follows:

  • Entero- refers to the intestine
  • Cutaneous refers to the skin
  • Fistula refers to an abnormal passage between two epithelialized surfaces

The fistula may arise from the duodenum, jejunum, ileum, colon, or less commonly from the stomach.

Classification[edit]

Enterocutaneous fistulas can be classified in several ways.

By cause[edit]

  • Postoperative fistula - occurs after abdominal surgery, often after bowel resection, anastomotic leak, abscess, or wound breakdown
  • Spontaneous fistula - occurs without recent surgery, commonly due to Crohn's disease, malignancy, infection, or radiation injury
  • Traumatic fistula - occurs after penetrating or blunt abdominal trauma
  • Inflammatory fistula - associated with inflammatory bowel disease, diverticulitis, or other inflammatory conditions
  • Malignant fistula - associated with cancer invading the bowel or abdominal wall

By location[edit]

By output volume[edit]

Fistulas are often described by how much fluid they drain in 24 hours:

  • Low-output fistula - usually less than 200 mL per day
  • Moderate-output fistula - usually 200 to 500 mL per day
  • High-output fistula - usually more than 500 mL per day

High-output fistulas are more likely to cause dehydration, electrolyte disturbances, and nutritional problems.

By complexity[edit]

A fistula may be considered simple or complex.

A simple fistula usually has a single tract, no associated abscess, no distal obstruction, and no major active disease.

A complex fistula may have one or more of the following:

Causes[edit]

Most enterocutaneous fistulas develop after abdominal surgery. Other causes include inflammatory, infectious, malignant, traumatic, and ischemic processes.

Common causes include:

Risk factors[edit]

Risk factors for developing an enterocutaneous fistula include:

Pathophysiology[edit]

An enterocutaneous fistula develops when the wall of the gastrointestinal tract loses integrity and forms an abnormal pathway to the skin. This may happen after a surgical connection between two bowel segments breaks down, after an abscess erodes into the bowel and skin, or when inflammation or cancer destroys tissue.

Once the fistula forms, intestinal contents pass through the tract to the skin surface. The drainage may contain digestive enzymes, bile salts, bacteria, and partially digested food. These substances can damage the surrounding skin and cause inflammation, pain, and infection.

The body may close some fistulas spontaneously, especially if the patient is stable, well nourished, and free of uncontrolled infection or obstruction. However, fistulas are less likely to close if there is ongoing sepsis, distal obstruction, active inflammatory disease, cancer, radiation injury, foreign body, epithelialized tract, or high-output drainage.

Signs and symptoms[edit]

Symptoms vary depending on fistula location, output, and underlying disease.

Common signs and symptoms include:

  • Drainage from an opening in the abdominal wall
  • Fluid, bile, gas, mucus, or stool coming through the skin
  • Redness or irritation around the wound
  • Abdominal pain
  • Fever or chills
  • Foul-smelling drainage
  • Nausea or vomiting
  • Poor appetite
  • Weight loss
  • Weakness
  • Dehydration
  • Dizziness or lightheadedness
  • Low urine output
  • Rapid heart rate
  • Signs of sepsis

Complications[edit]

Enterocutaneous fistulas may cause serious complications.

Sepsis[edit]

Sepsis is one of the most important and dangerous complications. It may result from an undrained abscess, infected fluid collection, wound infection, or ongoing leakage of bowel contents.

Signs of sepsis may include:

  • Fever
  • Chills
  • Confusion
  • Low blood pressure
  • Rapid heart rate
  • Rapid breathing
  • Worsening abdominal pain
  • Reduced urine output

Malnutrition[edit]

Malnutrition is common because patients may lose protein, fluid, and electrolytes through fistula output. Patients may also eat less because of nausea, abdominal pain, infection, or fear of increasing drainage.

Fluid and electrolyte imbalance[edit]

High-output fistulas can cause large losses of water and electrolytes, including:

These imbalances may lead to weakness, confusion, muscle cramps, abnormal heart rhythm, kidney injury, and worsening illness.

Skin injury[edit]

The skin around the fistula may become inflamed and painful because intestinal drainage contains enzymes and irritants. Skin protection is an essential part of care.

Abscess[edit]

An intra-abdominal abscess may form if infected fluid collects inside the abdomen. Abscesses often require drainage.

Diagnosis[edit]

Diagnosis is based on clinical findings, laboratory tests, imaging, and assessment of the fistula tract.

History and physical examination[edit]

The clinician evaluates:

  • Recent abdominal surgery
  • History of Crohn's disease
  • Prior radiation therapy
  • Cancer history
  • Trauma history
  • Fever or signs of infection
  • Amount and character of drainage
  • Skin condition around the fistula
  • Nutritional status
  • Fluid balance and urine output

Laboratory tests[edit]

Useful laboratory tests may include:

Imaging studies[edit]

Imaging helps define fistula anatomy and identify abscesses or obstruction.

Common imaging tests include:

Fistula output measurement[edit]

The amount of drainage is measured over 24 hours. Output volume helps guide fluid replacement, nutrition planning, and prognosis.

Differential diagnosis[edit]

Conditions that may resemble or be confused with an enterocutaneous fistula include:

Management[edit]

Management of enterocutaneous fistula is often summarized by several major goals:

  • Stabilize the patient
  • Control sepsis
  • Replace fluid and electrolytes
  • Protect the skin
  • Provide adequate nutrition
  • Define fistula anatomy
  • Control fistula output
  • Decide whether conservative management or surgery is needed

Care is usually best provided by a multidisciplinary team, including surgeons, gastroenterologists, wound care nurses, dietitians, interventional radiologists, and critical care specialists when needed.

Initial stabilization[edit]

Initial treatment focuses on life-threatening problems.

Important steps include:

  • Assess airway, breathing, and circulation
  • Treat shock if present
  • Give intravenous fluids
  • Correct electrolyte abnormalities
  • Start antibiotics if infection or sepsis is suspected
  • Drain abscesses when present
  • Measure fistula output
  • Protect the skin around the fistula
  • Begin nutritional assessment and support

Sepsis control[edit]

Control of infection is central to treatment. If an abscess is present, antibiotics alone are usually not enough. Drainage may be required by:

  • Image-guided percutaneous drainage
  • Surgical drainage
  • Opening and drainage of infected wounds

Uncontrolled sepsis worsens malnutrition and reduces the chance of fistula closure.

Fluid and electrolyte management[edit]

Patients with enterocutaneous fistula may lose large amounts of fluid and electrolytes. Replacement must be individualized based on output volume, laboratory values, kidney function, and clinical status.

Management may include:

  • Intravenous fluids
  • Oral rehydration solution when appropriate
  • Sodium replacement
  • Potassium replacement
  • Magnesium replacement
  • Bicarbonate replacement in selected cases
  • Careful monitoring of urine output
  • Daily weight measurement
  • Strict intake and output charting

Nutrition[edit]

Nutrition is one of the most important parts of treatment. Adequate nutrition supports wound healing, immune function, and the possibility of spontaneous closure.

Nutrition strategies may include:

  • High-protein diet if oral intake is safe
  • Enteral nutrition when the gut can be used
  • Parenteral nutrition when enteral feeding is not possible or insufficient
  • Vitamin and mineral supplementation
  • Monitoring of body weight, albumin, prealbumin, and nitrogen balance

Enteral nutrition is generally preferred when feasible, but parenteral nutrition may be required in high-output fistulas, proximal fistulas, severe malnutrition, bowel obstruction, or inability to tolerate enteral feeding.

Wound and skin care[edit]

Skin protection is essential because fistula drainage can rapidly damage the surrounding skin.

Wound care may include:

  • Barrier creams or films
  • Ostomy appliances
  • Fistula pouching systems
  • Absorbent dressings
  • Negative pressure wound therapy in selected cases
  • Frequent skin assessment
  • Measurement of drainage output
  • Control of odor and leakage

A specialized wound or ostomy nurse can help choose appliances that protect the skin and improve patient comfort.

Output control[edit]

Reducing fistula output may help fluid balance and skin care.

Possible approaches include:

  • Avoiding excessive oral hypotonic fluids in high-output fistulas
  • Oral rehydration solutions when appropriate
  • Acid suppression with proton pump inhibitors or H2 blockers
  • Antimotility agents in selected patients
  • Antisecretory medications such as octreotide in selected high-output cases
  • Nutritional adjustments
  • Drainage control with pouching systems

Medication choices depend on fistula location, output, infection status, and physician judgment.

Conservative treatment[edit]

Some enterocutaneous fistulas close without surgery if the patient is stable and favorable conditions exist.

Conservative management may be appropriate when:

  • Sepsis is controlled
  • No distal obstruction is present
  • There is no active malignancy
  • There is no foreign body
  • Nutrition is adequate
  • Fistula anatomy is favorable
  • Output is low or manageable
  • Skin is protected

Conservative care requires close monitoring because complications can develop quickly.

Surgery[edit]

Surgery may be required if the fistula does not close, if complications persist, or if the underlying cause requires operative treatment.

Indications for surgery may include:

  • Persistent fistula despite optimized care
  • Distal bowel obstruction
  • Active malignancy
  • Foreign body
  • Uncontrolled sepsis
  • Complex fistula anatomy
  • Severe skin or wound problems
  • Recurrent abscess
  • Failure of nutritional rehabilitation
  • Diseased bowel requiring resection

Definitive surgery is often delayed until sepsis is controlled, nutrition is improved, inflammation has decreased, and the abdominal wall is suitable for repair. Surgery may involve resection of the fistula-bearing bowel segment, repair of the abdominal wall, drainage of abscesses, and restoration or diversion of bowel continuity.

Factors affecting spontaneous closure[edit]

Some factors make spontaneous closure more likely, while others make it less likely.

Favorable factors[edit]

  • Low-output fistula
  • Long fistula tract
  • No distal obstruction
  • No active infection
  • No abscess
  • Good nutritional status
  • Healthy surrounding bowel
  • No malignancy
  • No foreign body

Unfavorable factors[edit]

  • High-output fistula
  • Short fistula tract
  • Distal obstruction
  • Active Crohn's disease
  • Cancer
  • Radiation injury
  • Foreign body
  • Epithelialized fistula tract
  • Ongoing abscess or sepsis
  • Severe malnutrition
  • Open abdomen
  • Multiple fistulas

Prevention[edit]

Not all enterocutaneous fistulas can be prevented, but risk can be reduced by careful surgical technique, early recognition of complications, and management of underlying disease.

Preventive strategies include:

  • Optimizing nutrition before major surgery when possible
  • Controlling Crohn's disease and other inflammatory conditions
  • Treating infection promptly
  • Avoiding unnecessary foreign material in contaminated fields
  • Careful creation of bowel anastomoses
  • Recognizing and treating anastomotic leaks early
  • Managing diabetes and other conditions that impair wound healing
  • Smoking cessation before elective surgery
  • Appropriate wound care after surgery

Prognosis[edit]

The prognosis depends on the cause, location, output, patient condition, infection control, nutritional status, and presence of other diseases. Some fistulas close with conservative treatment, while others require surgery.

Poor prognostic factors include:

  • Uncontrolled sepsis
  • Severe malnutrition
  • High-output fistula
  • Active malignancy
  • Radiation injury
  • Distal obstruction
  • Multiple fistulas
  • Advanced age or severe comorbid illness

With specialized multidisciplinary care, many patients can recover, although treatment may require weeks to months.

Patient care and quality of life[edit]

An enterocutaneous fistula can affect physical comfort, mobility, nutrition, body image, sleep, and emotional well-being. Patients may feel embarrassed, anxious, or socially isolated because of drainage, odor, or frequent dressing changes.

Supportive care may include:

  • Education about the condition
  • Wound and pouching support
  • Nutritional counseling
  • Pain control
  • Psychological support
  • Social work assistance
  • Home health nursing
  • Support groups
  • Caregiver training

When to seek urgent care[edit]

Patients with known or suspected enterocutaneous fistula should seek urgent medical attention for:

  • Fever or chills
  • Confusion
  • Dizziness or fainting
  • Rapid heart rate
  • Severe abdominal pain
  • Increasing redness or swelling around the wound
  • Foul-smelling drainage
  • Sudden increase in fistula output
  • Very low urine output
  • Signs of dehydration
  • Blood in drainage or stool
  • Inability to eat or drink

See also[edit]

References[edit]


External links[edit]

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