What is vasospasm?
In addition to ICAS, there can be other causes for narrowing of blood vessels that can interfere with blood flow to the brain. Another possible cause is vasospasm, or the contraction of the muscles in the arterial wall, narrowing it’s diameter and restricting blood flow. Vasospasm can occur as a natural response to injury of the artery. Though the contraction of the vessel can be a good thing in that it can prevent bleeding into the brain in a ruptured vessel, it can also restrict flow and cause ischemia and stroke. In this case, vasospasm may also be treated with intracranial angioplasty and stenting.