The child, a 6-year-old female, presented to the outpatient clinic with hoarseness and dyspnea for 2 hours, and was considered to have a third-degree laryngeal obstruction, and was proposed to be intubated with a face mask to administer oxygen to 80% of spO2, and after intravenous steak injection of propofol 40 mg, a tracheal tube with ID = 4.5 mm was inserted under the video laryngoscope to assist ventilation. The child had mucopolysaccharide syndrome, long-term chronic hypoxia, heart failure, combined with umbilical hernia. He was induced with 7 mg of intravenous furosemide, and after sitting in the end position, his SPO2 rose to 90%, BP: 122/55 mmHg, HR: 122 beats/min. After stabilization, 120 was notified to continue resuscitation treatment at Children’s Hospital.