1. Any contraindication to bronchoscopy, for example: (a.) Untreatable life-threatening arrhythmias, (b.) Inability to adequately oxygenate the patient during the procedure, (c.) Acute respiratory failure with hypercapnia (unless the patient is intubated and ventilated), (d.) Recent myocardial infarction, (e.) Previously diagnosed high-grade tracheal obstruction, (f.) Uncorrectable coagulopathy.