What are the indications for tracheal stents?

Here are some common indications for placing tracheal stents:

- Tracheal stenosis - narrowing of the trachea, often due to scarring from prolonged intubation or tracheostomy. Stents help reopen the airway.

- Tracheomalacia - weakness and collapse of the tracheal walls. Stents provide structural support.

- Following laryngotracheal surgery - stents can provide stability while healing occurs.

- After tracheoesophageal fistula repair - stents cover the repair site while it heals.

- Malignant airway obstruction from intrinsic or extrinsic tumor compression. Stents relieve obstruction.

- Tracheoinnominate artery fistula - stents cover the fistula and prevent bleeding. - Tracheal trauma - stents can reopen the airway after damage.

- External compression - from thyroid goiters, lymphadenopathy, etc. Stents counter the pressure.

- Dehiscence of tracheal anastomosis - stenting reinforces the anastomosis.

- Severe refractory asthma - in some cases, stents reduce dynamic airway collapse. 

The main goal of tracheal stenting is to reopen and support a collapsed, obstructed, or compromised airway when other treatments are not sufficient. Careful patient selection and sizing are important for successful stent placement.