Cerebral stroke is a group of acute cerebrovascular diseases that produce paralysis, unfavorable speech, numbness of limbs, dizziness, nausea, vomiting, unstable walking, coma, and even death due to acute ischemia or hemorrhage in brain tissue, and is characterized by high morbidity, high disability, high recurrence rate and high mortality. The Ministry of Health announced in 2008 that cerebrovascular disease has become the first cause of death in the ranking of causes of death of our residents, and the mortality rate is 4 to 5 times higher than that of European and American countries, 3.5 times higher than that of Japan, and even higher than that of developing countries such as Thailand and India. The mortality rate of cerebral stroke in China is 4 to 6 times higher than that of myocardial infarction. Stroke not only causes human health damage and life threatening, but also brings heavy medical, economic and social burdens to patients, their families and society, bringing 10 times more economic burden than myocardial infarction. According to statistics, 27% of strokes are fatal, while most stroke patients survive and are left with disabilities that seriously affect their quality of life, such as paralysis and aphasia. Research by our scholars shows that the proportion of recurrent strokes in China is as high as 37% to 40%, and 25% to 33% of stroke patients will have another attack within 3 to 5 years. These data reflect the seriousness of the danger of stroke. Ischemic stroke, also known as cerebral infarction (including cerebral thrombosis, cerebral embolism) is the most common type of stroke, caused by the formation of blood clots in the blood supply arteries of the brain or blocked by emboli from other parts of the body, resulting in ischemia and necrosis of the corresponding parts of the brain tissue. The brain relies heavily on its blood supply arteries to carry fresh blood, which brings oxygen and nutrients to the brain, while carrying away carbon dioxide and metabolic waste. Once the artery is blocked, the brain cells cannot produce enough energy, and the brain cells in the core area will generally stop working within a few minutes and will soon become necrotic, and once the brain cells are necrotic, they cannot be repaired. The brain cells in this area are temporarily in the transition period after ischemia occurs, and if the blood flow can be restored in time, the brain cells can survive, while if the ischemia continues, brain cell necrosis may occur, and the focus of our rescue for stroke patients is to restore the brain cells in this “ischemic semi-dark zone”; make them transform to the good side without necrosis. The most effective way to promote this “ischemic semi-dark zone” brain cells to the good side is early thrombolytic therapy, so that the thrombus can be dissolved, the artery can be reopened, and the blood flow can pass smoothly. However, the timing of thrombolysis is limited, and there is a strict time window, that is, within the first 3 hours of ischemic stroke, thrombolysis is effective in most patients; 3-6 hours may be effective in some patients; that is, the blocked blood vessel can be reopened, the function of brain tissue will not be seriously damaged, and there will be little or no sequelae; if thrombolysis is performed more than 6 hours later, it is of little significance, as irreversible brain cell necrosis has already occurred at that time. Necrosis has already occurred. Therefore, we remind patients that if they have stroke symptoms such as limb paralysis, unfavorable speech, numbness, dizziness, nausea, vomiting and unstable walking, they should not wait at home or rely on it, but call 120 immediately and come to the hospital urgently to provide time for thrombolytic treatment. Unfortunately, due to many reasons, 99% of patients in China cannot reach the hospital within 3-6 hours and receive effective thrombolysis treatment, and even in developed countries such as Europe and America, the early thrombolysis rate is still quite low. It is hoped that through more publicity, the general population will have more knowledge about stroke prevention and treatment, so that more patients can receive timely and effective thrombolytic treatment and reduce disability and death. The prevention of stroke is more important than the treatment of stroke. As early as 1500 years ago, Sun Simiao, the sage of medicine, proposed in his “Thousand Gold Essentials” that “the top doctor should cure the disease that is not yet sick, the middle doctor should cure the disease that wants to be sick, and the bottom doctor should cure the disease that is already sick”. In order to reduce the morbidity and mortality of stroke, universal screening of high-risk groups and the promotion of ABCDE prevention and control strategies (A: antithrombotic treatment; B: blood pressure and weight control; C: cholesterol reduction, smoking cessation, stenting and carotid endarterectomy; D: diabetes control, diet adjustment; E: health education, physical exercise, regular checkups), that is, to strengthen the treatment and education of high-risk groups to avoid the occurrence of stroke and benefit the general public. For high-risk groups with underlying vascular lesions of stroke, early screening of the cause and extent of lesions and appropriate intervention is an important preventive and control measure. In previous prevention and control of cerebrovascular disease, our population has generally paid attention to the control of hypertension, and consequently the prevalence of cerebral hemorrhage is decreasing, but there is insufficient awareness and attention to the narrowing of blood vessels caused by carotid atherosclerotic plaque, which is one of the important causes of ischemic stroke, so that a large number of patients with pre-ischemic stroke are not detected in time and given effective intervention. In fact, carotid artery atherosclerosis screening is relatively simple and inexpensive. Ultrasound examination of the carotid arteries can detect most patients with carotid artery atherosclerosis and stenosis, and can determine the nature of their atherosclerotic plaques and the degree of stenosis, and patients with severe stenosis can be detected by neck auscultation. By screening the condition of carotid arteries, it is possible to give early behavioral guidance or pharmacological interventions to patients with less severe stenosis to slow down the progress of stenosis, and to take interventional or surgical treatment to patients with severe stenosis to remove the source of ischemic stroke and reduce the occurrence of stroke and disability. For patients with carotid atherosclerotic plaque and luminal stenosis >70%, interventional treatment (stenting) is less invasive and reliable, and is one of the recommended effective treatment methods.