Subclavian steal phenomenon is normally observed in patients with stenosis of subclavian artery proximal to orifice of vertebral artery(V0). However, uremic patients undergoing hemodialysis using vascular access in the arm or forearm may also develop dialysis associated steal syndrome(DASS).For patients with symptomatic subclavian steal phenomenon, the treatment for these two groups is different. The investigators want to see if the investigators can use noninvasive duplex examination instead of invasive conventional angiography to do the differential diagnosis.
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Change of Subclavian Flow to Normal Flow Pattern During Cuff Test
Timeframe: two years
no Change of Subclavian Arterial Flow During Cuff Test
Timeframe: one year
Change of Vertebral Flow to Normal Flow Pattern During Cuff Test
Timeframe: two year
no Change of Vertebral Arterial Flow During Cuff Test
Timeframe: 2 years