The prime time for CPR is not measured in seconds, but is usually between 4 and 6 minutes. After cardiac arrest, blood flow will be interrupted, resulting in insufficient blood and oxygen supply to the brain, resulting in brain tissue damage. If CPR is performed promptly within 4 to 6 minutes, the risk of damage to the brain and other vital organs can be minimized. If this time period is exceeded, even if the patient's life is saved, severe brain damage or even long-term coma may occur due to cerebral ischemia and hypoxia.

Therefore, it is crucial to master the correct cardiopulmonary resuscitation method and carry out rescue within the golden time. When performing cardiopulmonary resuscitation, you need to pay attention to the correct methods and techniques to avoid secondary injury to the patient. At the same time, you should also call the rescue hotline in time so that professional medical personnel can arrive as soon as possible and provide further treatment.

It is important to note that CPR is not a simple skill and requires correct technique and judgment. Personnel without professional training may not be able to perform CPR accurately and may even cause harm to the patient. Therefore, it is recommended that the public receive professional cardiopulmonary resuscitation training so that they can provide correct and effective treatment in an emergency.

The golden time of cardiopulmonary resuscitation generally refers to the best time window for rescue after cardiac arrest. It is generally 

believed that this time window is 4 to 6 minutes.

Within this time window, if correct cardiopulmonary resuscitation operations are performed promptly, including chest compressions and artificial respiration, the patient's blood circulation and respiratory function can be maintained to the maximum extent and the success rate of rescue can be improved. If this time window is exceeded, the patient's brain cells may be irreversibly damaged due to lack of oxygen. Even if the heartbeat and breathing are restored, serious sequelae may remain and even lead to death.

Therefore, for patients with cardiac arrest, cardiopulmonary resuscitation should be started as soon as possible and the emergency number should be called to seek help from professional medical personnel. At the same time, in order to improve the public's first aid awareness and skills, it is recommended to widely popularize cardiopulmonary resuscitation knowledge so that more people can master this basic first aid skill.