The "subclan steal syndrome" occurs due to: (A) Occlusion /stenosis of the veebral aery, (B) Occlusion/stenosis of the carotid aery, (C) Occlusion of the subclan aery proximal to origin of veebral aery, (D) Occlusion of the subclan aery distal to origin of veebral aery
Answer is C. *Subclan steal:when the arm is used,blood is stolen from the brain the veebral aery .this lead to veebro-basilar ischemia ,which is characterised by dizziness ,coical blindness and/or collapse. Ref Harrison20th edition pg 2456