A rare cause of noninvasive ventilation failure: tracheal stenosis.

Noninvasive ventilation is the first line treatment of choice in acute respiratory failure in many diseases including post-extubation respiratory failure. Herein we report a case unresponsive to noninvasive ventilation due to tracheal stenosis. A 49- year -old female was admitted to intensive care unit after successful resuscitation of cardiac arrest. During the follow-up, she was extubated on 16th day and then transferred to the coronary ward. Four days later, she started to have progressive dyspnea and difficulty in breathing. Arterial blood gas evaluation showed respiratory acidosis with moderate hypercapnia. Noninvasive ventilation was initiated with the diagnosis of cardiogenic pulmonary edema however she did not respond to noninvasive ventilation therapy. Pulmonary consultation revealed that she had a new onset stridor. She had an urgent fiberoptic bronchoscopy which revealed severe tracheal stenosis. Tracheal stenosis should be considered in patients who do not respond to noninvasive ventilation after extubation like in our case.