What is a possible symptom of subclavian steal syndrome?

Subclavian steal syndrome occurs when there is significant stenosis or occlusion in the subclavian artery, which leads to reversed flow in the vertebral artery on the affected side. This condition can result in various neurological and vascular symptoms due to compromised blood flow to the brain and upper extremities.

The correct choice indicates that vertigo and diplopia can occur as symptoms of subclavian steal syndrome. Vertigo, a sensation of spinning or dizziness, may result from reduced blood flow to the brainstem or the cerebellum, which is responsible for balance and coordination. Diplopia, or double vision, may also arise due to disturbances in neurological function caused by the altered blood flow dynamics.

The other options present symptoms that are more closely associated with different vascular or neurological conditions. Reduced vision in one eye is typically indicative of ocular issues or conditions affecting the central retinal artery, while asymptomatic rest pain tends to be related to critical limb ischemia, which is not a hallmark of subclavian steal syndrome. Numbness in the lower extremities can arise from a variety of peripheral vascular issues but is not directly linked to the changes in blood flow resulting from subclavian steal syndrome affecting upper body circulation.