If the patient has dilated pupils, you need to immediately determine whether the patient is conscious, if the patient is not conscious with the carotid artery can not be touched, can be judged as cardiac arrest, at this time you must immediately carry out cardiopulmonary resuscitation, or can be effectively treated. Cardiopulmonary resuscitation must be carried out in accordance with strict procedures for standard operation, first give the patient chest compressions, take the midpoint of the double nipple line to press, the depth of pressure should be in the middle of the 5-6cm, the frequency of compressions at 100-120 times per minute, give the patient to quickly open the airway, clean up the secretions in the mouth, and then give the patient artificial ventilation, ventilation frequency is 10-12 times per minute, the ratio of compressions and ventilation is 10-12 times per minute. The ratio of compression to ventilation should be 30:2. After 5 rounds of this repeated procedure, observe whether the patient’s pupils are dilated and retracted, if not, continue CPR until the defibrillator comes to the patient’s bedside, and then continue to give electric defibrillation. With the above treatment, if the patient is within 4-6 minutes of respiratory arrest, active treatment is usually possible.