Subclavian steal syndrome

Subclavian steal syndrome is a constellation of signs and symptoms that arise from retrograde blood flow in the vertebral artery or the internal thoracic artery, due to a proximal stenosis and/or occlusion of the subclavian artery. The arm may be supplied by blood flowing in a retrograde direction down the vertebral artery at the expense of the vertebrobasilar circulation. Subclavian steal syndrome can result in symptoms such as: presyncope, syncope, neurological defects, blood pressure differential between the arms.