What are the complications of a pyloric stent?

Placement of a pyloric stent is generally safe, but there are some potential complications to be aware of:

- Migration - The stent can move or shift out of position, obstructing the opening or moving further down in the GI tract. This may require endoscopic replacement.

- Obstruction - Food or tumor tissue can still cause partial or complete blockage of the stent over time. Additional stents or surgery may be required.

- Bleeding - The stent can irritate the stomach lining and cause bleeding into the GI tract. This is usually minor.

- Perforation - There is a small risk of the stent puncturing through the stomach wall, which could cause peritonitis. Very rare.

- Infection - Bacteria introduced during the procedure could lead to an infection of the stomach lining (gastritis) or sepsis.

- Pain - The stent may cause feelings of indigestion, nausea, or abdominal discomfort. Medications can help manage this.

- Gastroesophageal reflux - The stent can worsen acid reflux in some patients. This often improves after stent removal.

- Stent fracture - With long-term use, stents can sometimes break or fracture. The fragmented pieces may need to be retrieved. 

Careful sizing of the stent and following up to check its position can help reduce complications. Patients with pyloric stents need close monitoring for any signs of these issues.