First aid measures for patients with acute pulmonary edema include correction of hypoxia, adjustment of body position, medication, and elimination of causative factors. When acute pulmonary edema occurs, the patient may suddenly develop dyspnea, seated breathing, sweating, irritability, blue lips, pale face, coughing up large amounts of pink foamy sputum, or even hemoptysis. In severe cases, death may occur due to severe hypoxia and shock. The first aid measures for acute pulmonary edema are: 1. Correct hypoxia: give high-flow oxygen inhalation 6-8L/min, or use dimethylsilicone oil antifoaming aerosol inhalation, or use alcohol to moisten oxygen to reduce the tension of the alveolar surface foam and improve the patient’s ventilation function. If necessary, mechanical assisted ventilation can be given to correct the patient’s hypoxic state; 2. Adjust the position: the patient takes an end sitting position with both lower limbs hanging low to reduce the amount of return blood, thus reducing the heart burden; 3. Apply drugs to increase cardiac output and decrease ventricular filling pressure and peripheral resistance; apply aminophylline to relieve bronchospasm and increase myocardial contractility and renal blood flow; 4.