摘要To the Editor:A 52-year-old female patient was admitted to the hospital on November 10,2016,due to "four hours of cardiopulmonary arrest after fiber endoscopy." Twelve years ago,she was admitted for a radical operation of esophageal cancer and underwent radiotherapy and chemotherapy in our hospital.She had no history of respiratory disease,hemoptysis,or drug allergy.Two years ago,the patient underwent a follow-up fiber endoscopy in our hospital.Lidocaine was applied to the throat for surface anesthesia before the endoscopy operation.Propofol,along with oxygen inhalation,was administered intravenously for general anesthesia during the operation.Gastroscopy was performed smoothly,but the patient suddenly became unconscious.Blood spurted out from the airway during tracheal intubation.She was treated with dopamine/metaraminol bitartrate and aminophylline/methylprednisolone.After gaining consciousness,the patient was sent to the Intensive Care Unit.