About Brain Aneurysm
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Learn about the disease, illness and/or condition Brain Aneurysm including: symptoms, causes, treatments, contraindications and conditions at ClusterMed.info.
Brain Aneurysm
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Brain Aneurysm |
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Brain Aneurysm InformationBrain aneurysm facts
How is brain aneurysm diagnosed?The diagnosis of brain aneurysm begins with a high index of suspicion by the health care practitioner. The history of the headache, an acute onset of the headache, associated with a stiff neck and an ill-appearing patient on physical examination, typically lead the health care practitioner to consider the diagnosis and order a CT (computerized tomography) scan of the head. If the CT scan is performed within 72 hours of the onset of the headache, it will detect 93% to 100% of all aneurysms. In the few cases that are not recognized by CT, the health care practitioner may consider performing a lumbar puncture (LP, or spinal tap) to identify blood in the cerebrospinal fluid that runs in the subarachnoid space. Some hospitals will consider CT angiography of the brain instead of the LP. If the CT or the LP reveals the presence of blood, angiography is performed to identify where the aneurysm is located and to plan treatment. Angiography, where a catheter is threaded into the arteries of the brain and dye is injected while pictures are taken, can demonstrate the anatomy of the arteries and uncover the presence and location of an aneurysm. CT angiography or MR angiography may be performed without threading catheters into the brain as is the case with a formal angiogram. There is some controversy as to which type of angiogram is best to assess the patient, and the kind chosen depends upon the patient's situation and condition. Though the symptoms may suggest a brain aneurysm, other diagnoses may need to be considered. Migraine headache, meningitis, tumor, and stroke all may cause neurologic symptoms. Based on the patient's presentation, the health care practitioner will need to decide which tests and studies to use in addition to brain imaging to establish the correct diagnosis. What are future directions for the treatment of brain aneurysm?For those who survive an initial aneurysm rupture, blood vessel spasm (vasospasm) may be the villain in causing continued brain damage. Experiments to develop new drugs to control vasospasm are ongoing. Molecules that can cause spasm are being identified, and antibodies may be able to be produced to blunt their effect. Studies are also looking at the possibility that brain aneurysms may be hereditary, and perhaps screening of high-risk populations may be possible in the future. What are the signs and symptoms of brain aneurysm?The headache associated with a leaking aneurysm is severe. Blood is very irritating to the brain and surrounding membranes and causes significant pain. Patients may describe the "worst headache of their life," and the health care practitioner needs to have an appreciation that a brain aneurysm may be the potential cause of this type of pain. The headache may be associated with nausea, vomiting, and change in vision. A subarachnoid hemorrhage also causes pain and stiffness of the neck because the meninges become inflamed. However, the "worst headache of their life" complaint needs to be matched with physical findings to be considered a risk factor for a leaking aneurysm. What is a brain aneurysm and what causes a brain aneurysm?The Circle of Willis is the junction of the four many arteries, two carotid arteries and two vertebral arteries, that supply the brain with nutrition (especially oxygen and glucose). This loop of arteries is located at the base of the brain and sends out smaller branch arteries to all parts of the brain. The junctions where these arteries come together may develop weak spots. These weak spots can balloon out and fill with blood, creating the outpouchings of blood vessels known as aneurysms. These sac-like areas may leak or rupture, spilling blood into surrounding brain tissue. Aneurysms have a variety of causes including high blood pressure and atherosclerosis, trauma, heredity, and abnormal blood flow at the junction where arteries come together. There are other rare causes of aneurysms. Mycotic aneurysms are caused by infections of the artery wall. Tumors and trauma can also cause aneurysms to form. Drug abuse, especially cocaine, can cause the artery walls to inflame and weaken. Brain aneurysms are a common occurrence. At autopsy, incidental aneurysms that have never caused any symptoms or issues are found in more than 1% of people. Most aneurysms remain small and are never diagnosed. Some, however, may gradually become larger and exert pressure on surrounding brain tissue and nerves and may be diagnosed because of stroke-like symptoms including:
What is the outcome of brain aneurysm?Brain aneurysms are deadly. About 10% of patients with a ruptured aneurysm die before receiving medical care. If untreated, another 50% will die within a month, with 25% of patients sustaining another bleeding episode within a week. Aside from the bleeding issues, there is significant risk of artery spasm leading to stroke. Survival rates are increased in patients who present early to the hospital. Early diagnosis, aneursym repair, and control of blood vessel spasms with appropriate medications are all associated with increased survival. What is the treatment for brain aneurysm?Treatment for a symptomatic aneurysm is to repair the blood vessels. Clipping and coiling are two treatment options.
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