causes of vasospasm
A vasospasm is the narrowing of the arteries caused by a persistent contraction of the blood vessels, which is known as vasoconstriction. This narrowing can reduce blood flow. Vasospasms can affect any area of the body including the brain (cerebral vasospasm) and the coronary artery (coronary artery vasospasm). When the vasospasm occurs in the brain, it is often due to a subarachnoid hemorrhage after a cerebral aneurysm has ruptured.