Overview
Arteriosclerosis and atherosclerosis are sometimes used to mean the same thing, but there's a difference between the two terms.
Arteriosclerosis occurs when the blood vessels that carry oxygen and nutrients from the heart to the rest of the body (arteries) become thick and stiff — sometimes restricting blood flow to the organs and tissues. Healthy arteries are flexible and elastic. But over time, the walls in the arteries can harden, a condition commonly called hardening of the arteries.
Atherosclerosis is a specific type of arteriosclerosis.
Atherosclerosis is the buildup of fats, cholesterol and other substances in and on the artery walls. This buildup is called plaque. The plaque can cause arteries to narrow, blocking blood flow. The plaque can also burst, leading to a blood clot.
Although atherosclerosis is often considered a heart problem, it can affect arteries anywhere in the body. Atherosclerosis can be treated. Healthy lifestyle habits can help prevent atherosclerosis.
Symptoms
Mild atherosclerosis usually doesn't have any symptoms.
Atherosclerosis symptoms usually don't happen until an artery is so narrowed or clogged that it can't supply enough blood to organs and tissues. Sometimes a blood clot completely blocks blood flow. The clot may break apart and can trigger a heart attack or stroke.
Symptoms of moderate to severe atherosclerosis depend on which arteries are affected. For example:
- If you have atherosclerosis in your heart arteries, you may have chest pain or pressure (angina).
- If you have atherosclerosis in the arteries leading to your brain, you may have sudden numbness or weakness in your arms or legs, difficulty speaking or slurred speech, temporary loss of vision in one eye, or drooping muscles in your face. These signal a transient ischemic attack (TIA). Untreated, a TIA can lead to a stroke.
- If you have atherosclerosis in the arteries in your arms and legs, you may have symptoms of peripheral artery disease, such as leg pain when walking (claudication) or decreased blood pressure in an affected limb.
- If you have atherosclerosis in the arteries leading to your kidneys, you may develop high blood pressure or kidney failure.
Causes
Atherosclerosis is a slowly worsening disease that may begin as early as childhood. The exact cause is unknown. It may start with damage or injury to the inner layer of an artery. The damage may be caused by:
- High blood pressure
- High cholesterol
- High triglycerides, a type of fat (lipid) in the blood
- Smoking or chewing tobacco
- Diabetes
- Insulin resistance
- Obesity
- Inflammation from an unknown cause or from diseases such as arthritis, lupus, psoriasis or inflammatory bowel disease
Once the inner wall of an artery is damaged, blood cells and other substances may gather at the injury site and build up in the inner lining of the artery.
Over time, fats, cholesterols and other substances also collect on the inner walls of the heart arteries. This buildup is called plaque. Plaque can cause the arteries to narrow, blocking blood flow. The plaque can also burst, leading to a blood clot.
Risk factors
Hardening of the arteries occurs over time. Aging is a risk factor for atherosclerosis. Other things that may increase the risk of atherosclerosis include:
- A family history of early heart disease
- An unhealthy diet
- Diabetes
- High blood pressure
- High cholesterol
- High levels of C-reactive protein (CRP), a marker of inflammation
- Lack of exercise
- Obesity
- Sleep apnea
- Smoking and other tobacco use
Complications
The complications of atherosclerosis depend on which arteries are narrowed or blocked. For example:
- Coronary artery disease. When atherosclerosis narrows the arteries close to your heart, you may develop coronary artery disease, which can cause chest pain (angina), a heart attack or heart failure.
- Carotid artery disease. When atherosclerosis narrows the arteries close to your brain, you may develop carotid artery disease. This can cause a transient ischemic attack (TIA) or stroke.
- Peripheral artery disease. When atherosclerosis narrows the arteries in your arms or legs, you may develop blood flow problems in your arms and legs called peripheral artery disease. This can make you less sensitive to heat and cold, increasing your risk of burns or frostbite. Rarely, a lack of blood flow to the arms or legs can cause tissue death (gangrene).
- Aneurysms. Atherosclerosis can also cause aneurysms, a serious complication that can occur anywhere in the body. Most people with aneurysms have no symptoms. Pain and throbbing in the area of an aneurysm may occur and is a medical emergency. If an aneurysm bursts, it can cause life-threatening bleeding inside the body.
- Chronic kidney disease. Atherosclerosis can cause the arteries leading to the kidneys to narrow. Narrowing of these arteries prevents enough oxygen-rich blood from reaching the kidneys. The kidneys need enough blood flow to help filter waste products and remove excess fluids.
Prevention
The same healthy lifestyle changes recommended to treat atherosclerosis also help prevent it. These lifestyle changes can help keep the arteries healthy:
- Quitting smoking
- Eating healthy foods
- Exercising regularly
- Maintaining a healthy weight
- Checking and maintaining a healthy blood pressure
- Checking and maintaining healthy cholesterol and blood sugar levels
Diagnosis
Your health care provider will perform a physical exam and ask questions about your personal and family health history. You may be referred to a doctor that specializes in heart diseases (cardiologist).
Your provider may hear a whooshing sound (bruit) when listening to your arteries with a stethoscope.
Coronary calcium scanEnlarge image
Depending on the results of the physical exam, your health care provider may suggest one or more tests, including:
- Blood tests. Blood tests are usually done to check blood sugar and cholesterol levels. High levels of blood sugar and cholesterol raise the risk of atherosclerosis. A C-reactive protein (CRP) test also may be done to check for a protein linked to inflammation of the arteries.
- Electrocardiogram (ECG or EKG). This quick and painless test measures the electrical activity of the heart. During an ECG, sensors (electrodes) are attached to the chest and sometimes to the arms or legs. Wires connect the sensors to a machine, which displays or prints the results. An ECG can help determine if there's reduced blood flow to the heart.
- Exercise stress test. If your symptoms usually occur during exercise, your health care provider may recommend this test. You'll walk on a treadmill or ride a stationary bike while your heart is monitored. Because exercise makes the heart pump harder and faster than it does during most daily activities, an exercise stress test can show heart problems that might otherwise be missed. If you can't exercise, you may be given a medication that mimics the effect of exercise on your heart.
- Echocardiogram. This test uses sound waves to show blood flow through the heart. Sometimes it is done with exercise stress testing.
- Doppler ultrasound. Your provider may use a special ultrasound device (Doppler ultrasound) to measure your blood pressure at various points along your arm or leg. These measurements can show the speed of blood flow in the arteries.
- Ankle-brachial index (ABI). This test compares the blood pressure in the ankle with that in the arm. It's done to check for atherosclerosis in the arteries in the legs and feet. A difference between the ankle and arm measurements may be due to peripheral vascular disease, which is usually caused by atherosclerosis.
- Cardiac catheterization and angiogram. This test can show if the coronary arteries are narrowed or blocked. A long, thin flexible tube (catheter) is inserted in a blood vessel, usually in the groin or wrist, and guided to the heart. Dye flows through the catheter to arteries in the heart. The dye helps the arteries show up more clearly on images taken during the test.
- Coronary calcium scan. Also called a heart scan, this test uses computerized tomography (CT) imaging to create detailed pictures of the heart. It can show calcium deposits in the artery walls. Results of the test are given as a score. When calcium is present, the higher the score, the higher the risk of heart disease.
- Other imaging tests. Magnetic resonance angiography (MRA) or positron emission tomography (PET) also may be used to study the arteries. These tests can show hardening and narrowing of large arteries, as well as aneurysms.
reatment
Lifestyle changes, such as eating a healthy diet and exercising, may be all that is needed to treat atherosclerosis. But sometimes, medication or surgical procedures may be needed.
Medications
Many different drugs are available to slow — or even reverse — the effects of atherosclerosis. Here are some medications used to treat atherosclerosis:
- Statins and other cholesterol drugs. Aggressively lowering low-density lipoprotein (LDL) cholesterol — the "bad" cholesterol — can slow, stop or even reverse the buildup of fatty deposits in the arteries.Statins are commonly used to lower cholesterol, improve artery health and prevent atherosclerosis. There are many other types of cholesterol-lowering drugs. They include niacin, fibrates and bile acid sequestrants. You may need more than one type of cholesterol medication.
- Aspirin. Aspirin helps thin the blood and prevent blood clots. Daily low-dose aspirin therapy may be recommended for the primary prevention of heart attack or stroke in certain people. Daily use of aspirin can have serious side effects, including bleeding in the stomach and intestines. Don't start taking a daily aspirin without talking to your health care provider.
- Blood pressure medications. Drugs to lower blood pressure don't help reverse atherosclerosis. Instead they prevent or treat complications related to the disease. For example, certain blood pressure medications can help reduce the risk of a heart attack.
- Other medications. Drugs may be prescribed to control other health conditions — such as diabetes — that raise the risk of atherosclerosis. Medications may also be given to treat specific symptoms of atherosclerosis, such as leg pain during exercise.
Surgery or other procedures
Sometimes more aggressive treatment is needed to treat atherosclerosis. If you have severe symptoms or a blockage, you may need a procedure or surgery, including:
- Angioplasty and stent placement. This procedure — also called percutaneous coronary intervention (PCI) — helps open a clogged or blocked artery. A long, thin flexible tube (catheter) is inserted in a blood vessel, usually in the groin or wrist, and guided to the blockage. Then, a balloon on the tip of a catheter can be inflated to open the artery. A mesh tube (stent) is typically used to keep the artery open.
- Endarterectomy. Sometimes, surgery is needed to remove plaque from the walls of a narrowed artery. When the procedure is done on arteries in the neck (the carotid arteries), it's called a carotid endarterectomy.
- Fibrinolytic therapy. If a clot in an artery is blocking blood flow, your provider may use a clot-dissolving drug to break it apart.
- Coronary artery bypass graft (CABG) surgery. A surgeon takes a healthy blood vessel from another part of the body to create a new path for blood in the heart. The blood then goes around the blocked or narrowed coronary artery. CABG is an open-heart surgery. It's usually done only in those with many narrowed heart arteries.
