For patients who have been diagnosed with coronary artery disease, it is important to lower blood lipid levels to a lower level than normal, a problem that many patients with coronary artery disease do not realize. Blood lipids usually contain both triglycerides and cholesterol, and cholesterol is divided into high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C). LDL cholesterol is the culprit of coronary heart disease. It has been well documented that lowering LDL cholesterol can significantly reduce the occurrence of coronary heart disease, and even in patients who have already suffered from coronary heart disease, lowering LDL cholesterol can prevent recurrence. How much LDL cholesterol should be lowered and for how long varies from patient to patient. At present, the normal LDL cholesterol value on the laboratory test is mainly for normal people, and the normal value may not be uniform in different hospitals, such as 3.4 mmol/L or 4.1 mmol/L. For patients with coronary artery disease, LDL cholesterol is usually required to be controlled at 2.6 mmol/L; if they have suffered from myocardial infarction, they are expected to lower their LDL cholesterol to below 1.8 mmol/L. In addition, elevated lipids are usually the result of low function of the enzymes responsible for lipid metabolism and should be controlled by long-term medication, but if you do not take lipid-lowering drugs and do not strictly control your diet, your lipids are bound to rise again. In this way, once you have coronary heart disease, you should control your blood lipid level for life, that is, you should take medication for life to lower your blood lipid to a lower level. At present, commonly used lipid-lowering drugs such as statins can not only lower blood lipids, but also make atheroma plaque subside, which is the first-line drug for preventing coronary heart disease and preventing recurrence of coronary heart disease, and the safety of its long-term use has been widely confirmed.