Sudden cardiac death is now also a very critical illness often occurring in coronary heart disease. We frequently see news reports of sudden deaths at airports and public places. At such times, self-rescue is extremely difficult. Unless you have a history of coronary heart disease and carry medications with you, if you experience symptoms like chest tightness and shortness of breath, you could take these medications to help yourself. Otherwise, sudden cardiac death occurs abruptly, causing the heart to stop beating within a very short period, and the patient cannot self-rescue.