The chances of resuscitating sudden cardiac death are generally low. Sudden cardiac death refers to cardiac causes of cardiac and respiratory arrest and is characterized by an unpredictable time and form of death, often within an hour from the onset of loss of consciousness to death. Once sudden cardiac death is detected, CPR should be performed immediately. During cardiopulmonary resuscitation, anti-arrhythmic drugs and antihypertensive drugs are given as soon as possible to patients in condition, followed by opening the airway, administering oxygen, and defibrillation with electric shocks. Once a patient has suffered a cardiac arrest, it is possible to recover if the above resuscitation measures are taken, but the probability is small. Most patients will begin to experience irreversible brain damage within 4 ~ 6 minutes of cardiac arrest, eventually progressing to the stage of biological death. Even when sudden cardiac death occurs in the hospital, the resuscitation success rate is only 5-10%. The success rate is much lower when it occurs outside the hospital. So sudden cardiac death can be saved, but the probability is small. If there is any abnormality, you should go to the hospital for examination and treatment under the guidance of your doctor.