Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Heart Disease Health Center

Font Size

A Glossary of Heart Disease Terms


Angiotensin II Receptor Blockers (ARBs): A group of drugs used to treat high blood pressure.

Annulus: A ring of tough fibrous tissue that is attached to and supports the leaflets of the heart valve.

Anomalous Coronary Artery: The normal anatomy for the coronary arteries involves their origin from the aorta at each of two separate sites. People can be born with the origin of a coronary artery that comes from an abnormal site, and this can lead to problems of coronary ischemia, which can subsequently lead to a heart attack. Not all coronary anomalies need surgery, but some do, and the specific operation depends on which of the many varieties of coronary anomalies is present.

Antiarrhythmic: A drug that is used to treat abnormal heart rhythms.

Anticoagulant ("blood thinner"): A medication that prevents blood from clotting; used for people at risk for stroke or blood clots.

Antihypertensive: A medication used to treat high blood pressure.

Antioxidant: Some studies show that vitamins (A, C, and E) may help to limit the cellular damage caused by free radicals (which are released when tissue is being injured, such as during the progression of heart disease).

Aorta: Large artery leaving the heart. All blood pumped out of the left ventricle travels through the aorta on its way to other parts of the body.

Aortic Insufficiency : Aortic insufficiency refers specifically to the aortic valve, which is the valve the blood passes through as it leaves the heart and enters the aorta. When blood leaks back through the valve, it is known as aortic insufficiency. Small amounts of aortic insufficiency may be inconsequential, but larger amounts require repair or replacement of the aortic valve.

Aortic Valve: The aortic valve is the last valve through which the blood passes before it enters the aorta or main blood vessel of the body. The valve's role is to prevent blood from leaking back into the left ventricle from the aorta after it has been ejected from the heart.

Aortic Valve Replacement: When the aortic valve is diseased, it can become either stenotic (too narrow) or insufficient (leaky). In such cases, the aortic valve may need to be replaced with either a prosthetic or human valve. There are other types of valves used such as from a pig or cow; the type of valve replacement depends on the person's case.

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21

Today on WebMD

x-ray of human heart
A visual guide.
atrial fibrillation
Symptoms and causes.
heart rate graph
10 things to never do.
heart rate
Get the facts.
empty football helmet
red wine
eating blueberries
Simple Steps to Lower Cholesterol
Inside A Heart Attack
Omega 3 Sources
Salt Shockers
lowering blood pressure