“…If the heart rate is lower than 50 beats/min during the operation, give an intravenous injection of atropine injection 0.25 mg; if the decrease of systolic blood pressure exceeds 30% of T0, intravenous injection of m-hydroxylamine 0.5 mg; when both appeared at the same time, dopamine 3 mg was injected intravenously; if the patient has breath holding, body movement or severe choking cough during operation, resulting in tachycardia (> 120 beats/min), high blood pressure (SBP > 160 mmHg or DSP > 100 mmHg) and SpO 2 < 90%, the bronchoscope can retreat to the main airway, and the patient can be instructed to breathe deeply and increase the oxygen flow appropriately [ 15 ]. At the same time, the operator can give 2 ml of 2% lidocaine local spray anesthesia, and reduce heart rate and blood pressure if necessary.…”