Seventy-nine fiberoptic bronchoscopies were performed in 46 Patients during 2 years in the Intensive Care Unit of Severance Hospital, Yonsei Medical Center. Bronchoscopies were done more than twice in 13 patients. Forty-three bronchoscopies were done through the orotracheal tube in 27 patients, and narcotics and sedatives such as morphine sulfate, diazepam and lorazepam were added with pancuronium bromide during 52 bronchoscopy procedures in 21 patients. Ventilatory support was accomplished by control mode ventilation for 63 bronchoscopies in 37 patients. Twenty-four patients were from the surgical department, and 37 bronchoscopies were performed in 18 patients in a post-thoracotomy state. Twenty-two patients were nonsurgical patients. We performed 48 bronchoscopies in 26 patients to treat lung haziness, 14 bronchoscopies in 3 patients to confirm the operative anastomosis after pneumonectomy or tracheoplasty, and 11 bronchoscopies to confirm the airway patency and vocal cord movement. We obtained good results from 41 bronchoscopies performed for therapeutic purposes and 28 bronchoscopies done for diagnostic purposes. But in 4 patients with pleural effusion and pneumonia, we could not get any improvement in chest X-ray taken after bronchoscopy. We suggested other procedures in 6 patients for diagnosis or treatment, such as suspension laryngoscopy, thoracentesis, ultrasonogram and laser surgery.