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An aneurysm is an abnormal enlargement, distention, dilation, bulging, or ballooning of the wall of an artery.


Aneurysms affect arteries throughout the body, including the brain (cerebral aneurysm), the leg (popliteal artery aneurysm), the intestine (mesenteric artery aneurysm), and the aorta (abdominal or thoracic aortic aneurysm).

An aneurysm occurs when the pressure of blood passing through a section of weakened artery causes the vessel wall to bulge outward, forming a sort of balloon. Aneurysms are serious because they increase the risk of blood vessel rupture and subsequent bleeding into tissues. If the bulging stretches the arterial wall excessively, the artery may burst, causing a person to bleed to death. Rupture of a cerebral aneurysm results in stroke, the loss of blood supply to brain tissue resulting in the death of brain cells. As a rule, the larger the size of an aneurysm, regardless of location, the greater the chance it will ultimately bleed.

The aorta is the largest artery in the body. It arises from the left ventricle of the heart, ascending and bending over to descend through the chest and abdomen, and ends by dividing into two arteries called the common iliac arteries that go to the legs. Aortic aneurysms can be abdominal when they occur in the area below the stomach, or thoracic when they occur in the chest. Abdominal aortic aneurysms are the most common aneurysms. They increase in

frequency and size with age, and expand much more rapidly than thoracic aortic aneurysms.


Aneurysms are relatively common in people over 65 years of age. Risk indicators for some groups such as Caucasian males begin to increase at age 55. Some studies indicate that up to 5% of the population over 65 suffer some form of aneurysm. The patient population for aortic aneurysm repair is typically male with an average age of 65. In the past 30 years, the occurrence of this type of aneurysm has increased threefold. About 15,000 Americans die each year from ruptured aortic aneurysms. According to the American Association of Neurological Surgeons, every year, an estimated 30,000 people in the United States experience a ruptured cerebral aneurysm, and up to 6% of the population may be living with an unruptured aneurysm. Cerebral aneurysms occur in all age groups, but increase steadily for individuals age 25 and older. They are most prevalent in people ages 50 to 60, and about three times more prevalent in women.

Causes and symptoms

Aneurysms are caused by any condition that can weaken the walls of arteries. These include:

  • Atherosclerosis, the clogging, narrowing, and hardening of arteries.
  • High blood pressure (hypertension).
  • Traumatic injuries, or infections of the blood vessels.
  • Congenital defect in the structure of the muscular wall of arteries.

Research appears to show that some individuals have a genetic susceptibility to aneurysms. The genetic inheritance patterns have characteristics linked to an autosomal dominant gene. Within some families, rates of aneurysms can run as high as five to 10 times those found in the general population.

Prior to rupture, the symptoms associated with an aneurysm depend upon its location, size, and rate of expansion. A static aneurysm that does not bleed or adversely affect cerebral circulation or neighboring tissue may be without symptoms. In contrast, larger aneurysms or aneurysms which expand rapidly may result in symptoms such as swelling, loss of sensation, blurred vision, etc.

Just before an aneurysm rupture, patients typically experience some symptoms commonly associated with stroke. Depending on the size and location of the aneurysm about to rupture, a patient may suffer a severe headache, deterioration or disturbances of hearing, double vision, severe nausea and vomiting, and fainting .


Aneurysms can be diagnosed by physical examination, chest or stomach x ray, or by using ultrasound. The size and location can be determined using echocardiography or imaging techniques, such as arteriography, magnetic resonance imaging (MRI), and computed tomography (CT) scanning, and computerized tomographic angiography (CTA).


Treatment depends on the size and location of the aneurysm and the overall health of the patient. The two main treatment options are surgery and medications. Medications such as beta blockers and calcium channel blockers are used to lower pressure, relax blood vessels, and decrease the risk of rupture.

Abdominal aortic aneurysms require surgical repair with the two main procedures being open chest repair and endovascular repair. The first involves a major incision in the abdomen or chest under general anesthesia to remove the aneurysm and repair the aorta. In endovascular repair, the aneurysm is not removed, but a graft is inserted into the aorta to strengthen it.

A small cerebral aneurysm that has not burst may not need treatment. Treatment for ruptured cerebral aneurysms aims to stabilize the patient by maintaining an adequate heart rate and respiration while simultaneously seeking to decrease intracranial pressure. Surgery is often performed as soon as the patient is stabilized, ideally within 72 hours of the onset of rupture to expose the aneurysm and allow the placement of a clip across a strong portion of the vessel to obstruct the flow of blood through the weakened aneurysm. Repeat surgical procedures to seal an aneurysm are not uncommon.

Nutrition/Dietetic concerns

Some research reports have suggested that supplementation with micronutrients with antioxidant properties could minimize the decreases in muscle strength and physical function associated with abdominal aortic aneurysms. A recent study, performed in 2002, supplemented patients with a combination of vitamins and trace elements that included beta-carotene, vitamin C, vitamin E , selenium, and zinc . Results showed that supplementation had limited, but noticeable beneficial effects on strength and physical function following surgery.


Cerebral aneurysm patients may be require therapy after surgery. Rupture patients who have experienced bleeding may have some short or long term neurological deficits to varying degrees. In many cases, these deficits will decrease over time or disappear altogether. Physical, speech and occupational therapists can help patients regain neurological functions that may have been affected.


The overall prognosis for a cerebral aneurysm depends on several factors including the size, location, and stability of the aneurysm. Outcomes also depend on the patient's general health, neurological health, and age. With successful surgical repair, the outlook is often excellent. Although each aneurysm must be individually evaluated, in general, the prognosis for patients who have suffered a bleed is, however, guarded with mortality rates up 60% within a year of the initial bleeding incident. Approximately half of the survivors suffer some long-lasting disability. Patients with cerebral aneurysm can, however, fully recover with no long-lasting disorder.

Data regarding the prognosis for unruptured aneurysms is more tentative and not specific for cerebral aneurysms. Some long-term studies suggest that only 10% of patients might suffer leakage or bleeding from their aneurysm over a period of 10 years and only about a quarter of patients would experience bleeding from the aneurysm over a period of 25 years.


Aneurysms cannot be prevented, but in 2005, the United States Preventive Services Task Force has recommended that men between the ages of 65 and 75 who are or have been smokers should have a one-time ultrasound to screen for abdominal aortic aneurysm. It is to be hoped that the same recommendation will be extended to women with a history of smoking . It has been suggested that control of high blood pressure may help prevent some aneurysms.

Caregiver concerns

Aging is recognized as a significant factor in the development of aneurysms. Aortic aneurysms rarely produce clear-cut symptoms and are usually found during examinations done for other reasons. When symptoms occur, they most commonly include general complaints of abdominal or chest pain or discomfort. Hence, caregivers should investigate such complaints thoroughly in the senior age group.


Aorta —The largest artery in the body, arising from the left ventricle of the heart, ascending and bending over to descend through the chest and abdomen to end by dividing into two arteries called the common iliac arteries that go to the legs.

Cerebral artery —Any of the arteries supplying blood to the cerebral cortex.

Computerized tomographic angiography (CTA) —Imaging method that combines the technology of a conventional CT scan with that of traditional angiography to create detailed images of the blood vessels in the body.

Distention —Swelling or enlargement of a tissue due to internal pressure.

Ultrasound —The use of ultrasonic waves to image an internal body structure.


  • What type of aneurysm do I have?
  • What tests do I need?
  • Am I at risk for complications?
  • What happens during a CT angiography?
  • What is aneurysm repair?
  • What are the treatment options?



Hakaim, Albert G., editor. Current Endovascular Treatment of Abdominal Aortic Aneurysms. New York, NY: Wiley-Blackwell, 2005.

Khurana, Vini G., and Robert F. Spetzler. The Brain Aneurysm. Bloomington, IN: AuthorHouse, 2006.

Nussbaum, Eric S. Brain Aneurysms and Vascular Malformations. Philadelphia, PA: Xlibris Corporation, 2000.

Siles, Madonna, and Lawrence J. Beurel. Brain, Heal Thyself: A Caregiver's New Approach to Recovery from Stroke, Aneurysm, And Traumatic Brain Injuries. Charlottesville, VA: Hampton Roads Publishing Company, 2006.


de Donato, G., et al. “Abdominal aortic aneurysm repair in octogenarians: myth or reality?” Journal of Cardiovascular Surgery 48, no. 6 (December 2007): 697–703.

Geraghty, P. J. “Minimally invasive approaches to vascular procedures in the elderly.” Clinical Geriatric Medicine 22, no. 3 (August 2006): 575–584.

Goto, T., et al. “Gender differences in stroke risk among the elderly after coronary artery surgery.” Anesthesia and analgesia 104, no. 5 (May 2007): 1016–1022.

Rix, T. E., and T. Bates. “Pre-operative risk scores for the prediction of outcome in elderly people who require emergency surgery.” World Journal of Emergency Surgery 5 (June 2007): 2–16.


Aneurysm. Medline Plus Fact Sheet. (February 20, 2008)

Aneurysm Repair. Texas heart Information Center. (January 30, 2008)

Aneurysms. Medline Plus Health Topic. (February 20, 2008)

Minimally Invasive Surgery Fixes Aneurysms. Health Day. (January 30, 2008)


American Stroke Association: A Division of American Heart Association, 7272 Greenville Ave., Dallas, TX, 75231-4596, (414) 272-6071, (888) 4STROKE, (214) 706-5231,

Brain Aneurysm Foundation, 612 East Broadway, South Boston, MA, 02117, (617) 269-3870, [email protected], http//

National Institute of Neurological Disorders and Stroke (NINDS), P.O. Box 5801, Bethesda, MD, 20824, (301) 496-5751, (800) 352-9424,

National Stroke Association, 9707 East Easter Lane, Englewood, CO, 80112-3747, (303) 649-9299, (800) STROKES, (303) 649-1328, [email protected], http//

Monique Laberge Ph.D.

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Why Are Aneurysms Called Silent Killers?

How Do Aneurysms Happen?

How Do Doctors Diagnose and Treat Aneurysms?

How Are Aneuryms Prevented?


An aneurysm (AN-you-rizm) is an abnormal widening of a blood vessel that may cause massive bleeding, shock, or death if it ruptures (breaks open).


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Cardiovascular system

Cerebrovascular system

Circulatory system

Why Are Aneurysms Called Silent Killers?

Aneurysms are sometimes called silent killers because they may go undetected for years until they break open. The wall of a section of an artery*, vein*, or other blood vessel may become weak and begin to bulge, like an underinflated balloon whose air is squeezed from the ends to the middle. The bulge may grow slowly for years until one day the blood vessel wall gives way. When this happens, it becomes a medical emergency that may lead to death.

* artery
An artery is a vessel that carries blood from the heart to tissues in the body.
* vein
A vein is a vessel that carries blood to the heart. Veins have greater capacity and thinner walls than arteries and contain valves that prevent blood from flowing backward and away from the heart.

Aneurysms occur most often in the aorta, the large artery that runs from the heart down through the abdomen. More than 15,000 people a year die when an aneurysm in this area breaks. Aneurysms can occur in other parts of the chest and body. When they occur in the brain, they may lead to stroke*.

* stroke
A stroke occurs when a blood vessel bringing oxygen and nutrients to the brain bursts or becomes clogged by a blood clot or other particle. As a result nerve cells in the affected area of the brain, and in the specific body parts they control, do not function properly.

How Do Aneurysms Happen?

Aneurysms result when the normal structure of blood vessels becomes weak in one area. This can occur when fatty deposits of cholesterol accumulate on the walls of the blood vessels but also may result from infection or from trauma or be congenital*. An increased incidence of aneurysm may be seen with certain conditions, such as syphilis or Marfan syndrome. Many times, however, an aneurysm develops without any known cause.

* congenital
means present at birth.

The condition affects many more men than women. It also occurs more often in people who are older than age 55, who are smokers, or who have high blood pressure. People with other family members who have had aneurysms are more likely to develop aneurysms themselves.

There usually are no signs of a growing aneurysm. Sometimes, people feel pain in their abdomen, if that is where the aneurysm is. A large aneurysm in the abdomen may press against the spine and cause back pain. A burst aneurysm in an artery can kill a person quickly. One in the brain can cause symptoms of a stroke, like shock, numbness, paralysis, and vision loss.

Monster of a Headache

R.E.M. was rocking their way through Europe during their 1995 Monster Tour when drummer Bill Berry got a sudden, terrible headache and could not see. Berry had a brain aneurysm, which was operated on immediately. The surgery was a complete success, and the band was able to finish touring with their excellent drummer.

How Do Doctors Diagnose and Treat Aneurysms?

Fortunately, many aneurysms can be detected before they burst. Doctors often are able to feel the pulsating sensation of abdominal aneurysms through the skin. Also, aneurysms often cause subtle changes in how the heart sounds, and doctors might notice these changes when listening to the heart. The most reliable methods of checking for aneurysms are x-rays, ultrasound* exams, and other scans that give more detailed images of the body.

* ultrasound
exams or sonograms use inaudible sound waves that can be projected by special equipment to produce an image or picture of an organ or tissue. This can help doctors to diagnose an illness and determine how best to treat the patient.

Wait and see

If an aneurysm is discovered, sometimes a doctor will adopt a wait-and-see strategy, but often this depends on the aneurysms location, size, and the persons overall health. Small aneurysms might be checked every six months or so to be sure they are not growing. Aneurysms usually grow slowly, especially if the person adopts healthy lifestyle habits, which include not smoking, controlling blood pressure, exercising, reducing weight if necessary, not drinking alcoholic beverages, and eating an appropriate diet.


Sometimes surgery is required. One method involves removing the section that is bulging and replacing it with an artificial blood vessel. Newer techniques involve snaking a thin, flexible wire up from an artery in the leg to the aneurysm, where a tube or coils are attached to the arterys walls on either side of the aneurysm.

How Are Aneuryms Prevented?

It is most important to catch aneurysms before they break open. More than 60 percent of people whose aneurysms burst die before they reach the hospital, and a large percentage may die during or after emergency surgery. Regular medical care, surgery, and changing lifestyles allow the vast majority of people with aneurysms to recover.

See also


Marfan Syndrome



The U.S. National Institute of Neurological Disorders and Stroke posts a fact sheet about cerebral aneurysm at its website.

American Heart Association, 7272 Greenville Avenue, Dallas, TX 75231. The American Heart Association posts information about aortic aneurysms and many other heart conditions at its website. Telephone 800-242-8721

National Stroke Association, 96 Inverness Drive East, Suite I, Englewood, CO 80112-5112. The National Stroke Association website contains information about aneurysms and new surgical techniques. Telephone 800-787-6537

The Heart and Stroke Foundation of Canada posts a fact sheet about aneurysm at its website.

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aneurysm (an-yoor-izm) n. an abnormal balloon-like swelling in the wall of an artery, due to disease or congenital deficiency. aortic a. an aneurysm that most frequently occurs in the abdominal aorta, below the level of the renal arteries (abdominal aortic a., AAA). Beyond a certain size it is prone to rupture: an acute surgical emergency. arteriovenous a. a direct communication between an artery and vein, without an intervening capillary bed. berry a. a small saccular aneurysm commonly affecting branches of the circle of Willis in the brain. Usually associated with congenital weakness of the vessels, they are a cause of cerebral haemorrhage in young adults. Charcot-Bouchard a. a small aneurysm found within the brain of elderly and hypertensive subjects. Such aneurysms may rupture, causing cerebral haemorrhage. dissecting a. a condition in which a tear occurs in the lining of (usually) the first part of the aorta, which allows blood to enter the wall and track along (dissect) the muscular coat. A dissecting aneurysm may rupture or it may compress the blood vessels arising from the aorta and produce infarction (localized necrosis) in the organs they supply. ventricular a. a condition that may develop in the wall of the left ventricle after myocardial infarction. Heart failure may result or thrombosis within the aneurysm may act as a source of embolism.
aneurysmal adj.

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aneurysmchasm, spasm •enthusiasm • orgasm • sarcasm •ectoplasm • cytoplasm • iconoclasm •cataplasm • pleonasm • phantasm •besom • dirigisme •abysm, arrivisme, chrism, chrisom, ism, prism, schism •Shiism, theism •Maoism, Taoism •egoism • truism • Babism • cubism •sadism • nudism • Sufism • ageism •holism • cataclysm • monism • papism •verism • aneurysm • purism • Nazism •sexism • racism • paroxysm • autism •macrocosm • microcosm • bosom

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an·eu·rysm / ˈanyəˌrizəm/ (also an·eu·rism) • n. Med. an excessive localized enlargement of an artery caused by a weakening of the artery wall. DERIVATIVES: an·eu·rys·mal / -ˌrizməl/ adj.

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aneurysm Local dilatation (swelling and weakening) of the wall of a blood vessel, usually the result of atherosclerosis and hypertension; especially serious when occurring in the aorta, when rupture may prove fatal.