I. What kind of conditions should be suspected of having renal artery stenosis The following three conditions should be especially noted: 1, hypertension at a young age, this patient is often caused by renal artery stenosis. 2, the patient’s blood pressure is particularly high, and hypertension caused by renal artery stenosis is usually very high. 3, drug treatment is ineffective hypertension, hypertension caused by renal artery stenosis is generally very stubborn, conventional drugs, even large doses of drugs is difficult to control blood pressure to normal levels. Second, the common causes of renal artery stenosis: 1, caused by multiple aortitis. Multiple aortitis, also known as oriental beauty disease, is common in young women, and one type mainly affects the renal arteries, and almost the entire section of the renal artery is affected. 2. Caused by arteriosclerosis. This condition is common in the elderly and often involves a small segment of the renal artery that is significantly narrowed and the rest is normal. 3, Congenital. Patients tend to have small kidney size but relatively normal structure, which is a reduced version of normal kidney. 4. Caused by a mass compressing the renal artery. Among them, tumors are more common. Why renal artery stenosis can cause hypertension Don’t look at the kidney is not big, but its blood flow accounts for 1/5 of the whole body. renal artery stenosis, the kidney will not get enough blood supply. There is a type of cell inside the kidney called parabellar cell, which is particularly resistant to “hunger”. In order to get sufficient blood supply, they secrete a substance called renin, which in turn forms a substance called angiotensin in the body. The latter can cause blood pressure to rise, and conventional drugs for hypertension are very ineffective in lowering blood pressure in this type of hypertension. If the cause of the disease is not removed, the kidneys continue to secrete renin, which will cause stubborn hypertension. Not only is the blood pressure getting higher, but the kidneys themselves will also undergo structural changes due to ischemia, and eventually renal failure will occur. How to treat renal artery stenosis In the past, after a patient was found to have renal artery stenosis, the only way to control severe hypertension was to remove the diseased kidney so that it would no longer release substances that raise blood pressure. But the cost of removing the kidney is too great, and in the future, once the patient has lesions on the other side of the kidney, then eventually he or she will have to face the situation of kidney transplantation, and patients with polyarteritis major often have stenosis in both renal arteries. Obviously, kidney cutting is inappropriate. With the continuous development of new medical technologies and the unremitting efforts of clinicians, it is now possible to treat such patients with renal artery stenting and renal artery bypass grafting. The former is performed by puncturing the femoral artery, dilating the narrowed renal artery with a balloon, and then placing a vascular stent into the stenosis to prop up the renal artery. This procedure is suitable for patients with relatively limited narrowing of the renal artery, mainly in the beginning segment of the renal artery caused by atherosclerosis. This procedure is less invasive, takes less time to perform, and the patient recovers quickly, and is often able to get out of bed the day after surgery. However, in some patients, the stenosis of the renal artery is long and the wall of the stenosis is very thick and difficult to open, so stenting is often not effective. The treatment involves opening the abdomen and creating a separate vessel between the kidney and the abdominal aorta to improve blood flow, figuratively speaking, just like the Luanjin project. This procedure is mainly suitable for patients with renal artery stenosis in aortitis and other patients who are not suitable for stenting.