Coronary heart disease is the abbreviation of coronary atherosclerotic heart disease. Since the 1950s, coronary heart disease has become the leading cause of death in Western developed countries. In the United States, there are about 7 million cases of coronary heart disease each year, with about 1.5 million cardiac events and about $50 billion spent on coronary heart disease. The incidence of coronary heart disease in China is also increasing year by year, the incidence of coronary heart disease in China has increased 2-3 times in 10 years, acute myocardial infarction has increased more than 2 times in 10 years, and the death rate of coronary heart disease ranks third after tumor and cerebrovascular accident. The prevention of coronary heart disease is divided into primary prevention and secondary prevention. Primary prevention refers to reducing or controlling the susceptibility factors of coronary heart disease to reduce the incidence, which is the real prevention and the main prevention for middle-aged and elderly people. Secondary prevention is the use of pharmacological or non-pharmacological measures to prevent recurrence or exacerbation of coronary heart disease in patients already suffering from the disease. Hypertension, hyperlipidemia, hyperglycemia, high obesity, genetic factors, psychiatric factors, poor diet structure, insulin resistance, smoking, and low activity level are all risk factors for coronary heart disease. According to the susceptibility factors of coronary heart disease, the primary prevention includes: 1, control of blood pressure. 2.Rational diet structure and caloric intake, avoid overweight. Prevention and treatment of hyperlipidemia, reduce the level of blood quality of the population. 3.Cessation of smoking. 4.Actively treat diabetes. 5.Drink hard water. Soft water areas must be supplemented with calcium and magnesium. 6, avoid long-term mental tension, excessive excitement. 7, actively participate in physical exercise. Secondary prevention of coronary heart disease is for patients who have already suffered from coronary heart disease, in order to control or delay the progress of coronary heart disease, reduce the complications of coronary heart disease, keep the condition in a stable state for a long time, or make the original lesions improve, so as to achieve the purpose of reducing the disability rate and mortality and improving the quality of life. The three ABCDE steps of secondary prevention of coronary heart disease are as follows: 1. A ⒈ Aspirin (aspirin), that is, the use of anticoagulant antiplatelet drugs The main clinical drugs are: Aspirin enteric dissolved tablets Aspirin-Ect (Bay aspirin), Clopidegrel (platelet ADP receptor antagonist: Poliovel Plavix). Platelet membrane glycoprotein IIb/IIIa receptor antagonists (abciximab Repro) are theoretically the most potent anti-platelet aggregation agents available today and are expensive, so they are temporarily limited to patients undergoing intervention for acute coronary syndromes. The dose of aspirin for secondary prevention is clearly 75mg-150mg per day, with an average of 100mg. 2. A2. ACEI drugs: drugs containing pril (-pril), i.e. angiotensin converting enzyme inhibitors The main clinical drugs are: Captopril (Capoten): short-acting, first generation ACEI. Currently, it is mainly used in hypertensive emergencies for contained doses. The second generation drugs are medium-acting drugs, represented by Enalapril (Renitec), which is needed 1-2 times a day. The third generation drugs are more, mostly once a day, and the representative drugs are Cilazapril (Inhibace), Benazapril (Lotensin), Fosinopril (Monopril), Lisinopril (Zestril), and Perindopril. Perindopril (Yashida Acetril). In addition to lowering blood pressure, these drugs have clear renal and cardioprotective effects. In addition, ACEI is now recognized as a cornerstone in the treatment of chronic heart failure. 3, A3. ARB,: sartan-containing (-sartan) drugs, that is, angiotensin A receptor antagonists The main clinical drugs are: Losartan (Cozaar), Valsartan (Diovan) can also be used to prevent restenosis after stenting, Irbesartan (Aprovel ), and telmisartan (Micardis), which has a protective effect against end-stage renal disease. These drugs have no side effects of cough. They are used in people who are contraindicated to or cannot tolerate ACEI therapy. ARB alone is not superior to ACEI, ARB can also be used in combination with ACEI. ARB as the basic treatment of chronic heart failure is an alternative to ACEI. 4, B ⒈ Beta-Blocker (beta-blocker) The main clinical drugs are: Metoprolol Metoprlol (Betaloc Betaloc) fat-soluble beta-blocker, Bisoprolol (Concor) highly selective blocking beta 1 receptor blocker, Carvedilol Carvedilol (Dali full) Dilatrend) have both α and β receptor blocking effects. In addition to their well-known effects on lowering blood pressure and treating exertional angina, β-blockers are also one of the basic drugs in the treatment of chronic heart failure. Another prominent effect is the prevention of sudden death. The only two types of proven anti-arrhythmic sudden death are beta-blockers and amiodarone, and beta-blockers are the only drugs that can improve the prognosis. 5, B peal Bp Blood Pressure control (control blood pressure) control of blood pressure is the most important measure in the secondary prevention of coronary heart disease. According to WHO – IHS. 1999, USA – JNC Ⅶ2003, CHINA – Guidelines for the prevention and control of hypertension. 2005, ESH – European hypertension guidelines.2007 four guidelines (Guide lines), blood pressure should be controlled to normal levels, preferably to the ideal level. The ideal blood pressure for adults: 120/80mmHg, another for adults over 80 years old. In cerebral infarction, blood pressure should not be lowered too much, and intravenous hypotension should be given for SBP above 180 mmHg, oral hypotension should be taken for 150-180 mmHg, and no hypotension should be given below 150 mmHg. Emergency blood pressure lowering should be done with intravenous sodium nitroprusside, uradil or with Kepone. It is wrong to take nifedipine (cardiac pain) ordinary tablets. 6, B3. BMI control (body mass index control) body mass index control that weight loss or weight loss, so that BMI to maintain at 18.5-24.9kg/m2. In addition, obesity or a variety of metabolic diseases (insulin resistance) the core symptoms. Waist circumference is also a simple and easy indicator to evaluate obesity or overweight. Simple evaluation method: male waist circumference