If middle-aged and elderly people suddenly feel as if their chest is pressed by a big stone and they cannot breathe, they will have a crushing pain in front of their chest and a cold sweat on their head. If frequent attacks will be life-threatening. In the roadside, you can crouch down, or lean against the wall, or rest by the pole for a while; at home, you should immediately rest in bed to eliminate tension, and most patients can relieve themselves after a few minutes. Second, first-aid drugs For the middle-aged and elderly, especially patients who have been diagnosed with coronary heart disease, it is best to carry a coronary heart disease health box or quick-acting heart pills, nitroglycerin tablets and other first-aid drugs, once the attack immediately sublingual nitroglycerin tablets 1 to 2, or quick-acting heart pills 5 to 10 pills to save themselves, and then go to a nearby hospital for further examination and treatment. It is recommended that people with a history of coronary heart disease, hypertension, diabetes, etc. should actively treat the original disease and try to avoid overexertion, excitement and agitation.