Heart Health Medical Reference

Tachycardia, or a fast heart rate, can be caused by many medications, including antibiotics, antidepressants, and even certain supplements.

Cardiac output is defined as the amount of blood your heart pumps. Learn about the normal output rate, how it's measured, and causes of low cardiac output.

Ejection fraction (EF) refers to the percentage of blood being pumped out of your heart’s lower chambers. If your EF is low, you could have heart failure. Here’s what you can do.

Ever feel woozy when you stand up? Find out why it happens, what can cause it, when it's a problem, and what you can do about it.

If you have a leaky heart valve, you may have surgery to repair or replace it. WebMD tells you what to expect.

Learn about two devices -- an ICD and pacemaker -- that can help you keep your heart beating correctly.

WebMD explains this rare but serious heart problem.

Tachycardia is a common, treatable condition that causes rapid heartbeat. WebMD explains what causes your heart to beat too fast and how doctors diagnose and treat it.

WebMD helps you understand the conditions that affect your heart and the habits that can help prevent or manage them.

Find out how to keep your numbers in check

WebMD provides information about the anatomy of the carotid artery. Find a picture, definition, and conditions that affect the artery.

WebMD provides a diagram and medical information about the anatomy of the arteries.

WebMD offers questions to ask your doctor about low blood pressure, or hypotension.

WebMD explains the causes, symptoms, and treatments for mitral valve prolapse.

A leaky heart valve may cause no problems or it may signify congestive heart failure. WebMD takes a look at the causes, symptoms, and treatments for a leaky heart valve.

WebMD describes the anatomy of human blood including what makes up our blood and how circulation works.

WebMD's Aorta Anatomy Page provides a detailed image and definition of the aorta. Learn about its function and location as well as conditions that affect the aorta.

WebMD's Heart Anatomy Page provides a detailed image of the heart and provides information on heart conditions, tests, and treatments.

WebMD looks at the herb astragalus root and whether or not it offers any specific heart benefits.

WebMD examines the use of arginine (L-arginine) to improve heart health. Find out where it comes from, if supplementation works, and its possible side effects.

They call HDL cholesterol your "good" cholesterol for a reason. Here are tips from WebMD for increasing your level of HDL cholesterol and boosting heart health.

Learn more from WebMD about the symptoms of low blood pressure, or hypotension, and when to call the doctor.

Low blood pressure, or hypotension, may be caused by a medical condition that can be treated with medication or, for many people, lifestyle changes. Learn more about low blood pressure from the experts at WebMD.

Learn more about the types and causes of low blood pressure, or hypotension, from the experts at WebMD.