Gastric fistula is an abnormal connection between the stomach (sleeve or bypass pouch) and an adjacent structure such as the skin, colon, pleura, or other viscera. Fistulas may develop after a chronic or unhealed gastric leak following sleeve gastrectomy or gastric bypass. Management includes endoscopic options (clips, stents, tissue sealants), surgical closure, or diversion and reconstruction depending on the fistula type, location, and chronicity.

The fistula tract is identified and evaluated. Endoscopic options include clip application, stenting, or endoscopic suturing. Surgical options include direct closure, sleeve or pouch resection, conversion to gastric bypass or OAGB, or complete diversion of the fistula with reconstruction. Nutritional optimization before and after repair is essential for healing.

Benefits include closure of the fistula, resolution of infection and sepsis, improved nutrition and quality of life, restoration of normal anatomy, and elimination of chronic leak‑related symptoms.

Candidates include patients with a confirmed gastric fistula after sleeve gastrectomy or bypass, chronic leak, recurrent infection, malnutrition related to fistula drainage, or failure of prior endoscopic treatment.

The procedure is performed endoscopically or laparoscopically depending on fistula type. Endoscopic repair uses clips, stents, or tissue sealants. Surgical repair may include direct closure, resection, or conversion to a different anatomical configuration. Drains are placed when needed. Nutritional support is provided throughout recovery.

Risks include recurrent fistula, leak, bleeding, infection, nutritional deficiencies, and need for reoperation. Fistula repair carries higher complexity due to prior inflammation and scar tissue.

Recovery varies by approach. Endoscopic repair: same‑day to next‑day discharge, liquid diet for several days. Surgical repair: 2–5 days hospital, liquid diet advancing to soft foods over 2–4 weeks. Nutritional labs monitored closely.

Most patients experience complete fistula closure after appropriate management. Some complex or chronic fistulas require staged repair or long‑term nutritional support.

Dr. Nestor de la Cruz‑Muñoz is a nationally recognized bariatric and metabolic surgeon with extensive experience managing complex gastric fistulas through both endoscopic and surgical approaches.

Weight loss is not the primary goal. Nutritional restoration is the priority during fistula management.

Fistula closure improves nutritional status, hydration, and quality of life. Metabolic improvements depend on the primary bariatric anatomy after repair.

After fistula closure, patients resume protein‑forward nutrition, hydration, and resistance training to restore lean mass and metabolic health.

Fistulas near the gastroesophageal junction may worsen reflux. Hiatal hernia repair is performed when needed.

If primary repair fails, options include re‑repair, diversion procedures, or staged reconstruction depending on the fistula location and patient condition.

Chronic fistulas cause significant lean mass loss. Nutritional restoration and resistance training are essential after repair.

Most insurers cover fistula repair when the diagnosis is confirmed with imaging or endoscopy and complications are documented.

Pre‑op requirements include bloodwork, nutritional labs, imaging, endoscopy, and optimization of nutritional and infectious status before repair.

Nutrition progresses from liquids to soft foods with emphasis on protein, hydration, and vitamin restoration. Nutritional labs are monitored closely.

Light activity resumes gradually. Resistance training resumes once nutritional status stabilizes and healing is confirmed.

Miami is a major hub for patients from Latin America and the Caribbean. Our team supports travel coordination and virtual follow‑up for complex cases.