Which statement about subclavian steal syndrome is FALSE?

The statement indicating that subclavian steal syndrome results from severe stenosis of the proximal subclavian artery is inaccurate. Subclavian steal syndrome occurs when there is a significant blockage or stenosis of the subclavian artery, typically proximal to the vertebral artery, leading to a reversal of blood flow in the vertebral artery on the side of the blockage. This condition allows the body to compensate for reduced blood flow to the arm, diverting blood from the vertebral artery, which can result in various neurological symptoms.

The other statements are factual: subclavian steal syndrome often affects the left side more frequently due to anatomical variations in the arterial supply; symptoms can indeed include dizziness, visual disturbances, and other neurological symptoms resulting from reduced vertebral perfusion; and it may contribute to lower blood pressure readings in the affected arm due to compromised blood flow. Each of these aspects underscores the characteristics and impacts of subclavian steal syndrome effectively.