What is brain vasospasm?
cerebral vasospasm is a term used to describe when the cerebral artery or smaller brain blood vessels have narrowed. The central lumen of blood vessels is narrowed in response to the contraction of the vessel wall. This narrowing prohibits blood flow.
Although brain vasospasm usually occurs due to the brain aneurysm that burst, it may also be caused by bleeding of the blood vessel, which is caused by the abnormality of blood vessels. It is believed that any increase in pressure around the outer part of the blood vessel, whether blood or liquid, may cause vasospasm. This belief coincides with vasospasms that occur after aneurysm rupture. With the abnormalities of blood vessels, such as malformation arteriovenus (AVM), the narrowing of the blood vessels is reactions to pressure caused by abnormality. In these cases, the subarachnoid cavity is filled with blood, called subarachnoid bleeding (SAH), but in smaller quantities than cracked aneurysms. Traumatic brain damage causes the SAH, which thencauses vasospasm.
doctors believe that there is cerebral vasospasm in the arteries and not in smaller blood vessels due to wall structures. Compared to smaller veins, arteriols or capillaries, the arteries have a thicker layer of smooth muscle, which strengthens the wall. This stronger wall means greater narrowing.
Cerebral vasospasm occurs mainly in the Willis circle, which is a vascular ring at the base of the brain. The main branches of this circle are more susceptible to vasospasm, but smaller arteries can also develop problems. Smaller arteries around the surface of the brain are also vulnerable.
Thdruhy classifications for brain vasospasm are subangiographical, clinical and angiographic. Vasospasm is classified into one of these three groups based mainly on its size. Patients may suffer from all signs of vasospasm, but cannot always be detected.
when the narrowing is not sufficiently significant or is difficult toé see affected containers, brain angiography will not be successful in locating convulsions. The patient may or may not have symptoms. In this case, the spasm is classified as a subangiographic brain vasospasm.
If brain vasospasm can be detected by angiography, with or without symptoms, it is classified as angiographic vasospasm. In most cases, patients show some symptoms, but the amount of experienced symptoms will vary depending on the location and severity of the convulsion. Clinical vasospasms are a type that represents all symptoms of messages, and no matter what angiography shows, the doctor can diagnose the spasm.