Definition of Heart failure:

Heart failure, also called congestive heart failure, is a life-threatening condition in which the heart can no longer pump enough blood to the rest of the body.

Causes, incidence, and risk factors:

Heart failure is almost always a chronic, long-term condition, although it can sometimes develop suddenly. This condition may affect the right side, the left side, or both sides of the heart.

As the heart's pumping action is lost, blood may back up into other areas of the body, including:

• The liver
• The gastrointestinal tract and extremities (right-sided heart failure)
• The lungs (left-sided heart failure)

With heart failure, many organs don't receive enough oxygen and nutrients, which damages them and reduces their ability to function properly. Most areas of the body can be affected when both sides of the heart fail.

The most common causes of heart failure are hypertension (high blood pressure) and coronary artery disease (for example, you have had a heart attack). Other structural or functional causes of heart failure include the following:

• Valvular heart disease
• Congenital heart disease
• Dilated cardiomyopathy
• Lung disease
• Heart tumor

Heart failure becomes more common with advancing age. You are also at increased risk for developing heart failure if you are overweight, have diabetes, smoke cigarettes, abuse alcohol, or use cocaine.