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Atherosclerosis is a slow disease in which your arteries become clogged and hardened. It is the underlying cause of most cases of heart attack, stroke, and vascular dementia and is found in 80 to 90% of Americans over the age of 30. Fat, cholesterol, calcium, and other substances form plaque, which builds up in arteries. Hard plaque narrows the passage that blood flows through. That causes arteries to become hard and inflexible (atherosclerosis is also known as hardening of the arteries). It contributes to the development of cardiovascular disease, which is the leading cause of death in people over 45. Soft plaque is more likely to break free from the artery wall and cause a blood clot, which can block blood flow to vital organs.
The effects of atherosclerosis differ depending upon which arteries in the body narrow and become clogged with plaque. If the arteries that bring oxygen-rich blood to your heart are affected, you may have coronary artery disease, chest pain, or a heart attack. If the arteries to your brain are affected, you may have a transient ischemic attack (TIA) or a stroke. If the arteries in your arms or legs are affected, you may develop peripheral artery disease. You may also develop a bulge in the artery wall (aneurysm).
Lowering blood pressure and LDL ("bad") cholesterol levels, eating a healthy diet with lots of fruits and vegetables, quitting smoking, losing weight, and getting more exercise can prevent atherosclerosis.
Signs and Symptoms
Many times, people with atherosclerosis don't have any symptoms until an artery is 40% clogged with plaque. Symptoms vary depending upon which arteries are affected.
Coronary Artery Disease
Symptoms of coronary artery disease (where the heart arteries are narrowed) are usually brought on by physical exercise, sexual activity, exposure to cold weather, anger, or stress. Common symptoms include:
Cerebrovascular disease (where the arteries that supply the brain with blood) are narrowed) can cause transient ischemic attack (a sudden loss of brain function with complete recovery within 24 hours) and stroke. Symptoms may include:
Peripheral Artery Disease
Peripheral artery disease affects the arteries that supply the arms and legs with oxygen-rich blood. Symptoms may include:
What Causes It?
No one knows the exact cause of atherosclerosis, although they do know what causes it to get worse. Many researchers believe it begins with an injury to the innermost layer of the artery, known as the endothelium. Researchers believe the following factors contribute to the damage:
Once the artery is damaged, blood cells called platelets build up there to try and heal the injury. Over time, fats, cholesterol, and other substances also build up at the site, which thickens and hardens the artery wall. The blood flow through the artery is decreased, and the oxygen supply to organs also decreases. Blood clots may form, blocking the artery or entering your bloodstream and cut off blood supply to other organs.
Because some people do not have the classic risk factors of atherosclerosis (such as cigarette smoking and high blood pressure), it is possible that there may be other causes, such as an infection. Research is ongoing.
Risk factors for atherosclerosis include:
What to Expect at Your Doctor's Office
Your doctor can determine your risk for heart disease by conducting certain tests. Blood tests can show high levels of cholesterol, homocysteine, and blood clotting factors. A stress test (also known as an exercise tolerance test) monitors your heart rate and blood pressure while you walk on a treadmill or ride a stationary bicycle. An electrocardiogram (ECG) is used during a stress test to detect abnormal heart rhythms, scar tissue in the heart muscle from a prior heart attack, and areas of decreased blood flow to the heart. Imaging techniques used during a stress test (such as an ultrasound) can pinpoint areas where blood flow to the heart may be reduced. An angiogram (or angiography), where your doctor injects a dye into your arteries and then performs a chest x-ray, can reveal areas of damage and plaque buildup.
You can prevent atherosclerosis by living a healthy lifestyle.
Healthy lifestyle choices are important in preventing and treating atherosclerosis. Your doctor may prescribe drugs to lower your cholesterol or blood pressure and to prevent complications. Nutrition and dietary supplements can help when used along with certain medications. Some herbs have also shown promise in lowering cholesterol levels and reducing the risk of heart disease.
Cholesterol Lowering Drugs
If, after making adjustments to your diet and exercise habits, your LDL cholesterol remains high, your doctor may prescribe medications to lower it. If your cholesterol is extremely high (more than 200 mg/dL), you may start drug therapy at the same time you make lifestyle changes. Drugs commonly used to treat high cholesterol include:
If you do not respond to one class of drugs, you doctor may use a combination of drugs from 2 classes.
Blood Pressure Lowering Drugs
Among the drugs used to lower blood pressure are:
Sometimes drugs from these classes may be combined.
Blood-thinning drugs -- antiplatelet agents and anticoagulants -- are used to keep blood clots from forming.
Surgery and Other Procedures
Several different procedures (surgical and nonsurgical) may be performed depending upon which arteries are narrowed and how much they are blocked.
Complementary and Alternative Therapies
Nutrition and Supplements
Healthy eating habits can help reduce high cholesterol, high blood pressure, and obesity -- three major risk factors for heart disease. The American Heart Association (AHA) has developed dietary guidelines to help lower fat and cholesterol intake and reduce the risk of heart disease. The AHA does not recommend very low-fat diets because research shows that unsaturated ("good") fats, such as those found in olive oil have health benefits.
Many fad diets are popular, but they may not help you lose weight and keep it off -- and in some cases, they may not even be healthy. Any healthy diet will include a variety of foods. If a diet bans an entire food group (such as carbohydrates), it's probably not healthy.
For healthy eating, the AHA recommends eating a balanced diet that contains the following:
In addition, the AHA also recommends eating 2 servings of fatty fish (such as salmon or lake trout) per week; holding sodium (salt, including salt already added to food) to less than 2,400 mg per day; and limiting alcohol intake to 1 drink a day for women and 2 for men.
Diets for People with High Blood Pressure
People with high blood pressure especially need to lower the amount of sodium in their diet. The DASH diet (Dietary Approaches to Stop Hypertension) emphasizes a diet rich in fruits, vegetables, and low-fat or nonfat dairy products that provide high intake of potassium, magnesium, and calcium. Sodium intake should be between 1,500 to 2,400 mg per day (the lower, the better). Weight loss, regular physical activity, and limiting alcohol are also important factors for lowering blood pressure.
The Mediterranean-style diet concentrates on whole grains, fresh fruits and vegetables, fish, olive oil, and moderate, daily wine consumption. The Mediterranean style diet is not low fat. Instead, it is low in saturated fat but high in monounsaturated fat. It appears to be heart healthy. In a long-term study of 423 patients who had a heart attack, those who followed a Mediterranean-style diet had a 50 to 70% lower risk of recurrent heart disease compared with people who received no special dietary counseling.
The TLC (Therapeutic Lifestyle Changes) Diet
This diet is recommended for people who have high cholesterol. With the TLC diet, less than 7% of your daily total calories should come from saturated fat, and only 25% -35% of your daily calories should come from total fat. Sodium should be limited to 2,400 mg per day. If these steps don't lower your cholesterol, your doctor may suggest adding more soluble fiber to your diet, along with plant sterols (found in cholesterol-lowering margarines and salad dressings).
Supplements and Vitamins
Talk with your doctor before taking any of these vitamins, minerals, or supplements to make sure they are right for you; to establish the proper dose for your condition; and to make sure they do not interact with any prescription drugs, herbs, or supplements you also might be taking.
Folic acid (400 mcg per day), vitamin B6 (25 to 100 mg per day), vitamin B12 (2 to 100 mcg per day) -- B vitamins help the body break down homocysteine, an amino acid that has been linked to increased risk of heart disease and stroke. Researchers think that homocysteine may also contribute to atherosclerosis by damaging artery walls, thus causing blood clots to form -- but so far they haven't found a definite link. Researchers also don't yet know whether taking B vitamins reduces the risk of atherosclerosis or heart disease, nor do they know how much might have an effect. However, recent studies suggest that high dose B vitamin supplementation significantly reduces the progression of early stage subclinical atherosclerosis. If you have several risk factors for heart disease, talk to your doctor about checking your homocysteine levels and ask whether you should take a B complex vitamin supplement. In the meantime, be sure to get enough B vitamins by eating fruits and leafy green vegetables every day. When selecting folic acid supplements, choose products that contain natural rather than synthetic folic acid. In 2010, some controversy emerged about folic acid with some scientists claiming adverse effects from high doses of folic acid over long periods of time and others disputing these claims. Folic acid also potentially interacts with many medications. Work with your physician to determine if and how much supplementation may be right for you.
Omega-3 fatty acids, found in fish oil (1 to 4 g per day) -- There is solid evidence that omega-3 fatty acids (namely EPA and DHA) found in fish oil can help protect against atherosclerosis by preventing the development of plaque and blood clots. Omega-3s can also help prevent heart disease, lower blood pressure, and reduce the level of triglycerides (fats) in the blood. One preliminary study found that people with high cholesterol who took fish oil and red yeast rice lowered cholesterol levels about as much as people who took simvastatin (Zocor). The AHA recommends that people eat at least 2 servings of fatty fish (such as salmon) per week. People with heart disease, or those who need to lower their triglyceride levels, may need to take fish oil supplements. Because fish oil at high doses can increase the risk of bleeding, talk to your doctor before taking a high dose (more than 1 g per day), especially if you already take blood-thinning medication.
Beta-sitosterol (800 mg to 6g per day in divided doses about 30 minutes before meals) -- Beta-sitosterol is a plant sterol, a compound that can stop cholesterol from being absorbed by the intestines. Several well-designed scientific studies show that beta-sitosterol lowers "bad" LDL cholesterol levels in the body. Beta-sitosterol may lower the amount of vitamin E and beta-carotene absorbed by the body, so ask your doctor if you need to take extra E or beta-carotene. Take caution if you are using Pravastastin (Pravachol) or Ezetimibe (Zetia). Talk to your doctor.
Potassium -- Your body needs potassium to keep electrolytes balanced and for nerves to function properly. Some diuretics may cause the body to get rid of too much potassium while other diuretics may increase potassium in the body. Check with your doctor before taking a potassium supplement if you take a diuretic. High levels of potassium can be dangerous. Potassium can also interact with certain blood pressure medications. Speak with your doctor.
Policosanol (5 to 10 mg 2 times per day) -- Policosanol is a mix of waxy alcohols usually derived from sugar cane and yams. Several studies have indicated it may lower "bad" LDL cholesterol and possibly even raise "good" HDL cholesterol. One study found that policosanol was equivalent to fluvastatin (Lescol) and simvastatin (Zocor) in lowering cholesterol levels. It may also stop blood clots from forming. However, most studies have been conducted in Cuba by a research group that uses a proprietary form of policosanol and is funded by the manufacturer, so it is hard to evaluate the evidence. Policosanol may increase the risk of bleeding, and should not be taken by people who also take blood-thinning medication.
Antioxidant vitamins (beta-carotene, C, E) -- Some large, observational studies have suggested that people who consume more antioxidant vitamins have a lower risk of heart disease than those who consume lower amounts. However, no studies have shown a cause and effect relationship.
Selenium (100 to 200 mcg per day) -- Some studies show that people who consume more selenium in their diet have a lower risk of heart disease, but again, researchers haven't shown a cause and effect relationship. One study even found that taking selenium for a long time significantly increased the risk of developing type 2 diabetes. There is a suggestion in the literature that selenium supplementation may decrease sperm motility and therefore negatively affect fertility in men. Selenium can interfere with many medications, including but not limited to blood-thinning medications and barbituates. Talk to your doctor before taking extra selenium.
Coenzyme Q10 (CoQ10) -- Researchers believe that CoQ10 may inhibit blood clot formation and boost levels of antioxidants. One study found that people who received daily CoQ10 supplements within 3 days of a heart attack were much less likely to experience subsequent heart attacks and chest pain. They were also less likely to die of the condition than those who did not receive the supplements. Still, more research is needed to say whether CoQ10 has any role in preventing or treating atherosclerosis. People who take statins may have lower amounts of CoQ10 in their bodies and may consider taking a supplement. If you take statins, ask your doctor if you need a CoQ10 supplement. Coenzyme Q10 can interact with certain high blood pressure medications, certain cancer medications, and blood-thinning medications, such as warfarin (Coumadin).
Polyphenols -- Polyphenols are chemical substances found in plants that have antioxidant properties. Test tube, animal, and some population-based studies suggest that the flavonoids quercetin, resveratrol, and catechins (all found in high concentration in red wine) may help reduce the risk of atherosclerosis by protecting against the damage caused by LDL cholesterol. However, more studies in humans are needed to confirm these findings.
One study of resveratrol in mice found that it protected against age related damage to vital organs, including the heart and liver, even when the mice ate a high fat diet. Although this study is promising, researchers need to confirm its findings and to see whether resveratrol would have the same effect in humans. No one is sure how much resveratrol you would need to experience benefits. In addition, resveratrol may have estrogen-like effects, and researchers don't yet know whether it would pose the same risks as estrogen supplements.
Vitamin D -- Preliminary studies suggest that vitamin D may help protect against heart disease, but researchers aren't sure why. One observational study found that women over the age of 65 who took vitamin D supplements to protect against osteoporosis had one third less risk of dying from heart disease as women who did not take the supplements. Another study found that vitamin D deficiency was associated with an increased risk of heart disease, especially among people with high blood pressure. Vitamin D may interact with certain medications. Speak with your doctor.
Acupuncture may help reduce risk factors for heart disease. It can help people who want to quit smoking. Some studies indicate that it may aid in weight loss as well as help lower cholesterol and blood pressure.
Although few studies have examined the effectiveness of specific homeopathic remedies, professional homeopaths may recommend appropriate treatments to reduce the risk of atherosclerosis based on their knowledge and experience. Homeopathic prescriptions for atherosclerosis may include remedies to lower high blood pressure and cholesterol. Before prescribing a remedy, homeopaths take into account a person's constitutional type. In homeopathic terms, a person's constitution is his or her physical, emotional, and intellectual makeup. An experienced homeopath assesses all of these factors when determining the most appropriate remedy for each individual.
Prognosis and Complications
Some complications of atherosclerosis include:
The outlook for atherosclerosis varies from person to person. People with atherosclerosis should work closely with their doctor to make appropriate lifestyle changes and, if needed, take the proper medications to control their condition and avoid complications.
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Review Date: 4/18/2013
Reviewed By: Steven D. Ehrlich, NMD, Solutions Acupuncture, a private practice specializing in complementary and alternative medicine, Phoenix, AZ. Review provided by VeriMed Healthcare Network.
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