Aortic Aneurysm

Overview

What is an aortic aneurysm?

An aortic aneurysm (say "a-OR-tik AN-yuh-rih-zum") is a bulge in a section of the aorta, the body's main artery. The aorta carries oxygen-rich blood from the heart to the rest of the body. Because the section with the aneurysm is overstretched and weak, it can burst. If the aorta bursts, it can cause serious bleeding that can quickly lead to death.

Aneurysms can form in any section of the aorta, but they are most common in the belly area (abdominal aortic aneurysm). They can also happen in the upper body (thoracic aortic aneurysm). Thoracic aortic aneurysms are also known as ascending or descending aortic aneurysms.

What causes an aortic aneurysm?

The wall of the aorta is normally very elastic. It can stretch and then shrink back as needed to adapt to blood flow. But some medical problems, such as high blood pressure and atherosclerosis (hardening of the arteries), weaken the artery walls. These problems, along with the wear and tear that naturally occurs with aging, can result in a weak aortic wall that bulges outward.

What are the symptoms?

Most aortic aneurysms don't cause symptoms. Sometimes a doctor finds them during exams or tests done for other reasons. People who do have symptoms complain of belly, chest, or back pain and discomfort. The symptoms may come and go or stay constant.

In the worst case, an aneurysm can burst, or rupture. This causes severe pain and bleeding. It often leads to death within minutes to hours.

An aortic aneurysm can also lead to other problems. Blood flow often slows in the bulging section of an aortic aneurysm, causing clots to form. If a blood clot breaks off from an aortic aneurysm in the chest area, it can travel to the brain and cause a stroke. Blood clots that break off from an aortic aneurysm in the belly area can block blood flow to the belly or legs.

How is an aortic aneurysm diagnosed?

Aneurysms are often diagnosed by chance during exams or tests done for other reasons. In some cases, they are found during a screening test for aneurysms. Screening tests help your doctor look for a certain disease or condition before any symptoms appear.

Experts recommend screening tests for abdominal aneurysms for men who are:

Ages 65 to 75 and have ever smoked.¹
At least 60 years old and have a first-degree relative (for example, father or brother) who has had an aneurysm.²

These men are more likely to have an aneurysm than are women or nonsmoking men.

Experts recommend screening tests for a thoracic aneurysm for anyone who has a close relative who has had a thoracic aortic aneurysm.³

If your doctor thinks you have an aneurysm, you may have tests such as an ultrasound, a CT scan, or an MRI to find out where it is and how big it is.

How is it treated?

Treatment of an aortic aneurysm is based on how big it is and how fast it is growing. If you have a large or fast-growing aneurysm, you need surgery to fix it. A doctor will repair the damaged part of the blood vessel during open surgery or a minimally invasive procedure.

Small aneurysms rarely rupture and are usually treated with high blood pressure medicine, such as beta-blockers. This medicine helps to lower blood pressure and stress on the aortic wall. If you don't have a repair surgery or procedure, you will have routine ultrasound tests to see if the aneurysm is getting bigger.

Even if your aneurysm does not grow or rupture, you may be at risk for heart problems. Your doctor may suggest that you exercise more, eat a heart-healthy diet, and stop smoking. He or she may also prescribe medicines to help lower high cholesterol.

Health Tools

Health Tools help you make wise health decisions or take action to improve your health.


	Decision Points focus on key medical care decisions that are important to many health problems.
	Abdominal Aortic Aneurysm: Should I Get a Screening Test?

Frequently Asked Questions

Learning about aortic aneurysms:	What is the aorta? What is an aortic aneurysm? What causes an aortic aneurysm? What are the symptoms of an aortic aneurysm? What happens in aortic aneurysm? What increases my risk for an aortic aneurysm?
Being diagnosed:	How is aortic aneurysm diagnosed? Should I get a screening test?
Getting treatment:	How is an aortic aneurysm treated? What medicines will I need to take? Will I need surgery?
Ongoing concerns:	What complications could happen?
Living with an aortic aneurysm:	What lifestyle changes will I need to make?

Cause

Abdominal and thoracic aortic aneurysms have a number of causes, including:

Hardening of the arteries (atherosclerosis). Exactly how atherosclerosis leads to abdominal aortic aneurysms is unclear. It is thought that atherosclerosis causes changes in the lining of the artery wall that may affect oxygen and nutrient flow to the aortic wall tissues. The resulting tissue damage and breakdown may lead to the development of an aneurysm.
Genetics. In some people who have Marfan's syndrome, Ehlers-Danlos syndrome, or other inherited conditions, the walls of the major arteries, including the aorta, are weakened. Aortic aneurysms run in families.
Aging. The aorta naturally becomes less elastic and stiffer with age, increasing the risk for an abdominal aortic aneurysm.
Infections. Infections such as syphilis and endocarditis, an infection of the lining of the heart, can cause aneurysms.
Injury. A sudden, intense blow to the chest or abdomen, such as hitting the steering wheel in a car accident, can damage the aorta.
Inflammation. Inflammation of the aorta can weaken the aortic wall. What causes the aorta to become inflamed is not clear.

Thoracic aortic aneurysms are much less common than abdominal aortic aneurysms. They are often caused by an abnormal breakdown of the elastic fibers in the aortic wall.

A pseudoaneurysm happens when a bulge occurs in the wall of the aorta. But the bulge doesn't affect all three layers of tissue in the wall of the aorta. This type of aneurysm might be caused by an injury.

Symptoms

Most people with aortic aneurysms, especially ones in the chest area (thoracic aortic aneurysms), do not have symptoms. But symptoms may begin to occur if the aneurysm gets bigger and puts pressure on surrounding organs.

If an aortic aneurysm bursts, or ruptures, there is sudden, severe pain, an extreme drop in blood pressure, and signs of shock. Without immediate medical treatment, death occurs.

Abdominal aortic aneurysm

The most common symptoms of abdominal aortic aneurysm include general abdominal (belly) pain or discomfort, which may come and go or be constant. Other symptoms include:

Pain in the chest, abdomen, lower back, or flank (over the kidneys), possibly spreading to the groin, buttocks, or legs. The pain may be deep, aching, gnawing, and/or throbbing, and may last for hours or days. It is generally not affected by movement, although certain positions may be more comfortable than others.
A pulsating sensation in the abdomen.
A "cold foot" or a black or blue painful toe, which can happen if an abdominal aortic aneurysm produces a blood clot that breaks off and blocks blood flow to the legs or feet.
Fever or weight loss, if it is an inflammatory aortic aneurysm.

Thoracic aortic aneurysm

Symptoms of a thoracic aortic aneurysm are most evident when the aneurysm occurs where the aorta curves down (aortic arch). They may include:

Chest pain, generally described as deep and aching or throbbing. This is the most frequent symptom.
Back pain.
A cough or shortness of breath if the aneurysm is in the area of the lungs.
Hoarseness.
Difficulty or pain while swallowing.

The symptoms of aortic aneurysm are similar to the symptoms of other problems that cause chest or belly pain such as coronary artery disease, gastroesophageal reflux (GERD), and peptic ulcer disease.

What Increases Your Risk

The leading risk factors for an aortic aneurysm are:

Being over 65 years old.
Being male.
Smoking.
High blood pressure.
Family history of aortic aneurysms in first-degree relatives (parent, brother, or sister).

Abdominal aortic aneurysms are about 5 times more common in men than in women. An aneurysm happens in about 3 to 9 men out of 100 who are older than 50.⁴

When to Call a Doctor

Call 911 or other emergency services immediately if you have signs of a ruptured aortic aneurysm such as:

Sudden, severe pain.
An extreme drop in blood pressure.
Signs of shock, such as passing out or feeling very dizzy, weak, or less alert.

If you witness a person become unconscious, call 911 or other emergency services and start cardiopulmonary resuscitation (CPR). The emergency operator can coach you on how to do CPR. For more information about CPR, see the Rescue Breathing and Cardiopulmonary Resuscitation section of the topic Dealing With Emergencies.

Call a doctor immediately if you have:

A pulsating mass in your abdomen.
Sudden weakness in the lower extremities on one side of the body.
Chest pain you have not experienced before.
A "cold foot" or a black or blue painful toe for no apparent reason.

Call for a doctor appointment if you have:

Pain in the chest, abdomen, or lower back, possibly spreading to the groin, buttocks, or legs. The pain may be deep, aching, gnawing, and/or throbbing, and may last for hours or days. It is typically not affected by movement, although certain positions may be more comfortable than others.
Fever or weight loss for no apparent reason.

Who to see

Health professionals who can evaluate symptoms that may be related to an aortic aneurysm and order the tests needed for further evaluation of symptoms include:

If you have a fast-growing aortic aneurysm, you may be referred to a vascular surgeon, who can evaluate your need for surgery.

Exams and Tests

Aortic aneurysms are often discovered during an X-ray, ultrasound, or echocardiogram done for other reasons. Sometimes an abdominal aneurysm is felt during a routine physical exam. If your doctor thinks you might have an aortic aneurysm, you will likely have a medical history and physical exam. You might have further tests to locate the aneurysm.

When an aneurysm is suspected or diagnosed, it is important to:

Pinpoint the location of the aneurysm.
Estimate its size.
Find out how fast it is growing.
Find out whether other blood vessels are involved.
See if there are blood clots or inflammation.

Medical history and physical exam

Your doctor may ask:

Do you have symptoms and when did they start?
Do you smoke?
Do you have other diseases, such as high blood pressure?
Do you have a family member who has had an aortic aneurysm?
Have you had a chest injury recently?

As part of a physical exam, your doctor might:

Listen to your heart to check for blood flow problems.
Feel your abdomen to check for a mass that might be an enlarged aorta. An aneurysm has to be a certain size, about 4 cm, before it can be felt.
Check your legs and feet.

If your doctor finds a mass in your abdomen, he or she will suggest further testing. If you are overweight and your doctor feels strongly that you may have an abdominal aortic aneurysm, he or she may also suggest further testing. This is because an abdominal aortic aneurysm is typically more difficult to find in those who are overweight.

Imaging tests

Tests to help find out the location, size, and rate of growth of an aneurysm include:

Abdominal ultrasound. Ultrasounds help your doctor know if your aneurysm is growing. If your aneurysm is large, you may need an ultrasound every 6 to 12 months. If your aneurysm is small, you may need one every 2 to 3 years.
Computed tomography (CT) and magnetic resonance angiogram (MRA), which are used if a view more detailed than an ultrasound is needed. This is important when information is needed about the aneurysm's relation to the blood vessels of the kidney or other organs. Your doctor needs this information especially before surgery. CT is used to watch the growth of a thoracic aortic aneurysm.
Echocardiogram, an ultrasound exam used to study the heart. A transthoracic echocardiogram (TTE) or a transesophageal echocardiogram (TEE) may be done to diagnose thoracic aortic aneurysm.
Angiogram. An angiogram can help your doctor know what the size of the aneurysm is and if there are aortic dissections, blood clots, or other blood vessel involvement.

Ongoing testing

One of the most important goals of testing is to estimate the risk that an aneurysm may burst, or rupture, and to compare the risk of rupture to the risks of surgery. If an aortic aneurysm is detected, tests such as abdominal ultrasound can be used to closely follow any change in the size or other aspect of the aneurysm and help measure the risk for rupture.

If you had an endovascular repair of an aneurysm, and you have a stent graft, you will need tests every year, such as a CT scan, to check for problems with the graft.⁵

Screening tests

For abdominal aortic aneurysm

Your doctor may recommend an abdominal ultrasound screening test if you are a man who is:

Age 65 to 75 and has ever smoked.¹
At least 60 years old and who has a first-degree relative (for example, father or brother) who has had an aneurysm.²

Some doctors think that other groups should be screened too. Talk to your doctor about whether the benefits of screening would outweigh the risks in your case.

Abdominal Aortic Aneurysm: Should I Get a Screening Test?

People who have Marfan's syndrome, Ehlers-Danlos syndrome, or another condition that puts them at risk may benefit from screening.

For thoracic aortic aneurysm

Your doctor may recommend screening tests for a thoracic aortic aneurysm if you have a close relative (parent, brother, or sister) who has had a thoracic aortic aneurysm.³

Treatment Overview

After you are diagnosed with an aortic aneurysm, your doctor will evaluate:

Whether you need the aneurysm repaired.
Whether you will be able to withstand a surgery or procedure.
Whether you should wait to repair the aneurysm and get regular tests to check its size and growth.

When repair is recommended

Aortic aneurysms that are causing symptoms or enlarging rapidly are considered at risk of rupturing. Repair is usually recommended if either of these factors is present.

In men, repair is also typically recommended for abdominal aortic aneurysms that are 5.5 cm or larger in diameter, causing symptoms, or are rapidly growing. In women, repair may be recommended for smaller aneurysms.

Repair of thoracic aortic aneurysms is usually recommended when they reach 5.5 to 6.0 cm in diameter.

Monitoring and medical treatment for aortic aneurysm

If surgery is not done to repair your aneurysm, you will have regular tests to see if it is getting bigger.

Smaller aneurysms (less than 5.5 cm in diameter) that are not at high risk for rupturing are typically treated with medicine used to treat high blood pressure, such as a beta-blocker. Beta-blockers may decrease the rate at which aneurysms grow. In general, the risks of surgery to repair smaller aneurysms outweigh the possible benefits, because smaller aneurysms rarely rupture.

You may need to take medicine to treat high cholesterol and high blood pressure. These measures have not been proved to slow aneurysm growth, but they can improve your life in other ways. These measures reduce your risk of dying from heart attack and stroke.

For more information, see:

Despite some claims, taking antioxidant vitamins has not been proved to reduce the risk of aneurysm or the risk of rupture.

Lifestyle changes for aortic aneurysm

If you smoke, try to quit. Medicines and counseling can help you quit for good.

Your doctor will probably recommend that you make other lifestyle changes, such as following a heart-healthy diet, limiting alcohol, and exercising. Try to do activities that raise your heart rate. Exercise for at least 30 minutes on most, preferably all, days of the week.

Ongoing Concerns

If you have an aortic aneurysm, you will see your doctor regularly to check on the size of the aneurysm. The size of the aneurysm and how fast it is growing both help determine how and when to treat it.

Rupture is a dangerous complication. As an aneurysm expands, the tension on the blood vessel wall increases. This causes the aneurysm to expand further, which puts even more tension on the wall. The larger the aneurysm gets, the greater the chances that it will grow larger and eventually burst. Your doctor will want to repair an aneurysm before it has a risk of rupture.

Blood clots in the aorta is another complication. When an aneurysm develops, it can damage the wall of the aorta. The damage leads to clot formation. A blood clot can narrow the aorta and slow down blood flow to the rest of the body. Pieces of the blood clot can break off and get stuck in the bloodstream. This blocks blood flow and causes damage to tissue beyond the blood clot.

Inflammatory aneurysms are not common, but they can cause complications like fever and weight loss. A massive inflammatory reaction can affect body parts close to the aorta, including part of the small intestine, the ureter, or the veins to the kidney. Any of these body parts can become blocked by the inflammation.

Living With an Aortic Aneurysm

If you have an aortic aneurysm, you need close medical monitoring and possibly treatment.

Go to your regular checkups. You will have regular tests to check the size and growth of the aneurysm. Talk with your doctor about how often you should get tested.

Home treatment is appropriate to help prevent or control conditions that may be causing you to have an aortic aneurysm, such as atherosclerosis or high blood pressure.

Quit smoking . Medicines and counseling can help you quit for good.
Control high blood pressure. To control high blood pressure, eat a low-sodium diet, and get regular exercise. For more information, see the topic High Blood Pressure.
Control high cholesterol. To control high cholesterol, eat a low-fat, low-cholesterol diet and get regular exercise. For more information, see the topic High Cholesterol.
Manage your weight. Losing weight will not likely change the course of an aortic aneurysm, but it may lower the risk of complications if you eventually need surgery. For more information, see the topic Weight Management.
Be active. Ask your doctor what type and amount of exercise is safe for you. If aerobic activity is safe, try to do activities that raise your heart rate. Exercise for at least 30 minutes on most, preferably all, days of the week.
Eat a heart-healthy diet. A heart-healthy diet includes fruits, vegetables, high-fiber foods, and foods low in saturated fat, trans fat, and cholesterol. For more information, see the topic Heart-Healthy Eating.

Medications

Medicines used to treat high blood pressure, such as beta-blockers, may be used to slow the growth rate of an aortic aneurysm.

If you have high cholesterol, your doctor might recommend that you take medicines, such as statins, to lower it. Having high cholesterol increases your risk of atherosclerosis, which can cause aortic aneurysms and other conditions, such as coronary artery disease and stroke.

Surgery

Thoracic or abdominal aortic aneurysms that are large, causing symptoms, or rapidly getting bigger are considered at risk of rupturing. A repair surgery or procedure is usually recommended if any one of these factors is present. A doctor uses a man-made graft to repair an aortic aneurysm.

Your doctor will consider:

Whether you need the aneurysm repaired right away.
Whether you will be able to withstand a surgery or procedure.
The shape and location of your aneurysm to see which repair option is possible.

When making a decision about repairing an aortic aneurysm, you and your doctor will think about the benefits in relation to the risks. People who are at significant risk from surgery might be able to have a less invasive repair procedure.

It is not an option to wait until an aneurysm has ruptured before surgery is done. Most people who have a ruptured aortic aneurysm die. Surgery for a ruptured aneurysm is dangerous because of the large amount of blood loss.

Abdominal aortic aneurysm

In men, repair is typically recommended for abdominal aortic aneurysms that are causing symptoms, are growing rapidly, or that are 5.5 cm or larger in diameter. In women, repair may be recommended for smaller aneurysms.

The decision to have your aneurysm repaired or not depends on other things too. These may include older age or medical problems that make the repair more dangerous.

Repair options are:

Talk to your doctor about the benefits and risks of each repair option to see which is better for you.

Thoracic aortic aneurysm

Your doctor will recommend that you have surgery for a thoracic aortic aneurysm based on many things. These include:³

The location of the aneurysm, such as the ascending or descending part of the aorta.
The size of the aneurysm. Repair might be recommended if an aneurysm is 5.5 to 6.0 cm in diameter.
Whether the aneurysm is part of a genetic problem, such as Marfan's syndrome.
Whether you need another heart surgery such as a heart valve replacement surgery.

Open surgery and the less invasive procedure, called endovascular repair, are the two options for repairing a thoracic aortic aneurysm. The choice of repair can depend on the size and location of the aneurysm.⁴

Many of the risks of surgical or endovascular repair are similar for abdominal and thoracic aortic aneurysms.⁶

Other Places To Get Help

Organizations

Society for Interventional Radiology
3975 Fair Ridge Drive
Suite 400 North
Fairfax, VA 22033
Phone:	1-800-488-7284
Web Address:	www.sirweb.org

The Society of Interventional Radiology is a national organization of physicians, scientists, and health professionals dedicated to improving public health through disease management and minimally invasive, image-guided therapies. Intervention radiology includes using X-rays, MRI, and other imaging to move a thin tube in the body, usually in an artery, to treat a disease. An example is angioplasty for heart disease. The Web site includes a section on patient information. This section gives information on therapies for various diseases and conditions. The Web site can also help you find a doctor.

Society of Thoracic Surgeons

633 North Saint Claire Street
Floor 23
Chicago, IL 60611
Phone:	(312) 202-5800
Fax:	(312) 202-5801
Web Address:	www.sts.org

The Society of Thoracic Surgeons provides patient information on surgeries of the chest and throat that are done by cardiothoracic surgeons. These surgeries include heart, lung, and throat surgery. The patient information section of the website describes diseases, surgeries, patient options, and what to expect after surgery. And using the website, you can search for surgeons in your area.

Agency for Healthcare Research and Quality: Consumers & Patients
540 Gaither Road
Suite 2000
Rockville, MD 20850
Phone:	(301) 427-1364
Web Address:	www.ahrq.gov/consumer

This Agency for Healthcare Research and Quality (AHRQ) website has evidence-based tips on staying healthy, choosing quality care, getting safe care, understanding diseases, comparing medical treatments, and more. AHRQ is part of the U.S. Department of Health and Human Services. It supports research that will help people make more informed decisions and improve the quality of health care services.

American Heart Association (AHA)
7272 Greenville Avenue
Dallas, TX 75231
Phone:	1-800-AHA-USA1 (1-800-242-8721)
Web Address:	www.heart.org

Visit the American Heart Association (AHA) website for information on physical activity, diet, and various heart-related conditions. You can search for information on heart disease and stroke, share information with friends and family, and use tools to help you make heart-healthy goals and plans. Contact the AHA to find your nearest local or state AHA group. The AHA provides brochures and information about support groups and community programs, including Mended Hearts, a nationwide organization whose members visit people with heart problems and provide information and support.

VascularWeb
Society for Vascular Surgery
633 North Saint Clair Street, 24th Floor
Chicago, IL 60611
Phone:	1-800-258-7188
Email:	vascular@vascularsociety.org
Web Address:	www.vascularweb.org

VascularWeb is a Web site provided by the Society for Vascular Surgery. This Web site provides information about vascular conditions for patients and families. VascularWeb can help you learn about how to prevent and treat vascular diseases, learn about vascular screening, and find a vascular surgeon.

Related Information

References

Citations

U.S. Preventive Services Task Force (2005). Screening for Abdominal Aortic Aneurysm. Available online: http://www.uspreventiveservicestaskforce.org/uspstf/uspsaneu.htm.

Hirsch AT, et al. (2006). ACC/AHA 2005 practice guidelines for the management of patients with peripheral arterial disease (lower extremity, renal, mesenteric, and abdominal aortic): A collaborative report from the American Association for Vascular Surgery/Society for Vascular Surgery, Society for Cardiovascular Angiography and Interventions, Society for Vascular Medicine and Biology, So

Hiratzka LF, et al. (2010). 2010 ACCF/AHA/AATS/ACR/ASA/SCA/SCAI/SIR/STS/SVM guidelines for the diagnosis and management of patients with thoracic aortic disease. Circulation, 121(13): e266–e369.

Braverman AC, et al. (2012). Diseases of the aorta. In RO Bonow et al., eds., Braunwald’s Heart Disease: A Textbook of Cardiovascular Medicine, 9th ed., vol. 2, pp. 1309–1337. Philadelphia: Saunders.

Rooke TW, et al. (2011). 2011 ACCF/AHA Focused update of the guideline for the management of patients with peripheral artery disease (Updating the 2005 guideline): A report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Journal of the American College of Cardiology, 58(19): 2020–2045.

Lau WC, Eagle KA (2009). Diseases of the aorta. In EG Nabel, ed., ACP Medicine, section 1, chap. 12. Hamilton, ON: BC Decker.

Other Works Consulted

De Bruin JL, et al. (2010). Long-term outcomes of open or endovascular repair or abdominal aortic aneurysm. New England Journal of Medicine, 362(20): 1881–1889.

Elefteriades JA, et al. (2011). Diseases of the aorta. In V Fuster et al., eds., Hurst's The Heart, 13th ed., pp. 2261–2289. New York: McGraw-Hill.

Eliason JL, Upchurch GR Jr (2008). Endovascular abdominal aortic aneurysm repair. Circulation, 117(13): 1738–1744.

Gornik HL, Creager MA (2007). Diseases of the aorta. In EJ Topol, ed., Textbook of Cardiovascular Medicine, 3rd ed., pp. 1473–1495. Philadelphia: Lippincott Williams and Wilkins.

Hirsch AT, et al. (2006). ACC/AHA 2005 practice guidelines for the management of patients with peripheral arterial disease (lower extremity, renal, mesenteric, and abdominal aortic): A collaborative report from the American Association for Vascular Surgery/Society for Vascular Surgery, Society for Cardiovascular Angiography and Interventions, Society for Vascular Medicine and Biology, So

Lau WC, Eagle KA (2009). Diseases of the aorta. In EG Nabel, ed., ACP Medicine, section 1, chap. 12. Hamilton, ON: BC Decker.

Lederle FA, et al. (2009). Outcomes following endovascular vs open repair of abdominal aortic aneurysm: A randomized trial. JAMA, 302(14): 1535–1542.

Rooke TW, et al. (2011). 2011 ACCF/AHA Focused update of the guideline for the management of patients with peripheral artery disease (Updating the 2005 guideline): A report of the American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines. Journal of the American College of Cardiology, 58(19): 2020–2045.

Schermerhorn ML, et al. (2008). Endovascular vs. open repair of adominal aortic aneurysms in the Medicare population. New England Journal of Medicine, 358(5): 464–474.

Smith SC, et al. (2011). AHA/ACCF secondary prevention and risk reduction therapy for patients with coronary and other atherosclerotic vascular disease: 2011 update: A guideline from the American Heart Association and American College of Cardiology Foundation. Circulation, 124(22): 2458–2473. Also available online: http://circ.ahajournals.org/content/124/22/2458.full.

United Kingdom EVAR Trial Investigators (2010). Endovascular versus open repair of abdominal aortic aneurysm. New England Journal of Medicine, 362(20): 1863–1871.

Credits

By	Healthwise Staff
Primary Medical Reviewer	E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer	David A. Szalay, MD - Vascular Surgery
Last Revised	February 22, 2012