Dog with severe tracheal collapse treated with nitinol stent

Abstract

A 2.7 kg, 11-year-old, castrated male Maltese dog was presented for evaluation of a 2-year history of intractable coughing, dyspnoea and cyanosis. A diagnosis of tracheal collapse with myxomatous mitral valve disease was made on the basis of inspiratory and expiratory thoracic radiographs, fluoroscopy and echocardiography. Measurement for stent size selection was performed on thoracic radiographs. A 10 mm (diameter) × 70 mm (length) self-expanding double-wire woven uncovered nitinol stent was used for intratracheal implantation and was deployed under fluoroscopic guidance. On thoracic radiography seven days after surgery, the position of the stent remained unchanged. On presentation six months after surgery, the owner reported that the dog was doing well without medical management. Although studies of various intraluminal stents have been reported in dogs, to the authors' knowledge, use of a double-wire woven uncovered nitinol stent has not been reported previously for the management of a dog with tracheal collapse. Since this particular type of stent with unfixed individual cells provided proper airway patency without stent fracture in the dog in this report, this stent might be used as an alternative to other commercially available nitinol stents in cases of thoracic inlet collapse.