Symptoms: discomfort in the precordial area, chest pain and chest tightness, longer pain in heart attack, which can last for more than 15-30 minutes, and a wider range, which can spread to the left anterior chest and upper middle abdomen, accompanied by nausea, vomiting, fever and other symptoms, and in severe cases, shock and even sudden death can occur; elderly patients or non-posterior sternal pain or dyspnea may not be accompanied by chest pain and no special symptoms. First aid: Stop all activities immediately during acute attack, rest in bed, minimize agitation, keep the room quiet so as not to stimulate the patient to aggravate the condition. Immediately take one nitroglycerin or 5-10 quick-acting heart pills. If you find that the patient has a weak pulse, cold extremities, indifferent expression, shock may occur, you should gently lower the patient’s head and elevate the feet to increase the amount of blood return; if the patient appears to be wheezing, spitting a lot of foamy sputum, and overly obese patients, prohibit the head low foot high position, so as not to aggravate chest tightness, you can give the patient a semi-recumbent position to reduce the load on the heart, let the patient sublingual nitroglycerin, heartburn, aspirin The patient can be placed in a semi-prone position to reduce the load on the heart.