Vascular cognitive dysfunction is a decline in cognitive function due to insufficient blood flow to the brain because of narrowed, or occluded, blood vessels. It’s patients who have, for example, dementia, or patients who clearly have cognitive insufficiency, poor reflexes, lack of clarity, lack of understanding, slow arithmetic, and who are often sleepy. When checking the carotid artery, or when checking the subclavian and vertebral artery systems, it is found that the blood vessels are severely narrowed, caused by insufficient blood flow. After opening the narrowed blood vessels, the cognitive function will be significantly improved, just like many patients feel like a big pot lid on their head before surgery, often sleepy and slow to react, but after surgery, many patients immediately become very smart, the pot lid on their head disappears, and their brain is very smart, they can see things clearly, which is directly related to ischemia. This is directly related to ischemia. Therefore, for this kind of cognitive dysfunction, the problem of stenosis or vascular occlusion must be solved first, and it will have a very great effect on cognitive function.