Final answer:
A cerebral angiogram for a patient with SAH is designed to visualize blood flow in the brain to identify vascular issues. It takes advantage of the constant blood supply provided to the CNS, particularly through the circle of Willis, and helps understand potential stroke risks.
Step-by-step explanation:
A patient with SAH (subarachnoid hemorrhage) ordered a cerebral angiogram should expect this test to visualize blood flow in the brain. This diagnostic procedure involves injecting a contrast dye into the blood vessels of the brain to make them visible on X-rays. It is often performed to locate blockages, aneurysms, or other vascular abnormalities within the brain. Importantly, blood flow to the brain is crucial as it is constantly perfused by the internal carotid and vertebral arteries, which are part of the circulatory system that supplies the CNS (Central Nervous System) with blood.
Understanding how disruption in circulation can lead to a stroke is a key aspect of this imaging procedure since uninterrupted blood flow is vital for brain function. The circle of Willis, a key arterial structure, plays a critical role in maintaining this constant blood supply to the brain.