Cerebral arterial steal syndrome is a condition in which severe stenosis and occlusion of the aortic arch and nearby large arterial vessels due to various causes results in a significant drop in pressure within the stenotic distal cerebral artery, and siphoning off other adjacent cerebral arterial blood flow to supply the artery with the lower pressure in lieu of its blood supply. Subclavian artery steal syndrome is one of them. The main symptoms include the following: 1. It is usually more common in men than in women, and the age is more than 50 years old. It is more common in those with left-sided damage. This may be due to the fact that the left subclavian artery makes a large angle at the beginning of the aorta and is susceptible to atherosclerosis caused by blood flow impulses. Neurologic symptoms of vertebrobasilar insufficiency and ischemic symptoms in the upper extremities may occur in this syndrome. Symptoms of carotid artery insufficiency are rare, and are only seen in patients with stenosis of the head and arm trunks or bilateral subclavian arteries. 2, vertebrobasilar artery blood supply insufficiency symptoms The most common symptoms are vertigo, limb palsy, sensory abnormalities, bilateral visual impairment, ataxia, diplopia, syncope, and rarely, intermittent claudication, dysphonia, dysphagia, tinnitus, convulsions, headache and mental disorders. In a few cases, there may be “tipping syndrome”, which is an episode of sudden loss of muscle strength in the lower limbs without aura and a fall, with no impairment of consciousness and rapid recovery, probably due to ischemia in the vertebral cross region of the medulla oblongata. Generally, this syndrome does not cause permanent nerve damage. 3.Upper limb ischemic symptoms are commonly seen as intermittent dyskinesia, upper limb weakness, pain and sensory abnormalities, and rarely cause cyanosis or necrosis of fingers. Clinical diagnosis is based on the affected side of the upper limb arterial pulsation significantly weakened or disappeared, blood pressure is lower than the healthy side of 20mmHg or more, systolic murmur can be heard on the same side of the neck, ultrasound found that the blood vessels are narrowed or occluded, and the activities of the affected limbs can induce or aggravate the symptoms of vertebral – basilar arterial insufficiency, etc. The diagnosis can be confirmed by the DSA examination which found that the contrast agent is refluxed into the affected side of the blood vessels. Currently, there are two main categories of commonly used surgical treatments: percutaneous transluminal angioplasty and various extra-anatomic bypasses. 1, percutaneous endoluminal angioplasty stenting percutaneous puncture delivery balloon catheter to the subclavian artery stenosis or occlusion, expansion of the balloon reconstruction of the arterial lumen, and stent implantation to prevent elastic retraction and arterial entrapment. It is suitable for stenotic subclavian artery steal syndrome. 2.Extra-anatomic bypass reconstruction For occlusion type or severe stenosis type, autologous saphenous vein or artificial blood vessel bypass, including carotid artery-subclavian artery, subclavian artery-subclavian artery, axillary artery-axillary artery bypass bypass grafting, and so on. 3. For elderly patients with atherosclerosis, anticoagulant or antiplatelet aggregating agents may be administered to reduce thrombosis and development. For rare cases caused by giant cell arteritis, steroid therapy can be used.