Most of the kidney ischemia is caused by the narrowing of both renal arteries, and a stent can be placed in the renal artery. When applying antihypertensive drugs, it is important to avoid sartan or priligy antihypertensive drugs. Kidney ischemia leading to renal hypofunction and finally developing into renal failure is clinically called ischemic nephropathy, which is caused by renal artery stenosis in most cases. The causes of renal artery stenosis are congenital causes, such as congenital renal artery dysplasia, mainly seen in adolescents. Another cause is acquired, seen in middle-aged and elderly people, which is due to the formation of atheromatous plaque in the renal artery, resulting in renal artery stenosis. For renal artery stenosis, it is usually necessary to put a stent in the renal artery to prop up the narrowed part to achieve the purpose of improving renal ischemia. When applying antihypertensive drugs, it is important to avoid sartans or prilosec antihypertensive drugs because they can aggravate renal ischemia.