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The cardiovascular system is comprised of the heart and the network of arteries, veins, and capillaries that carries blood throughout the body. The average adult male has between 5-6 liters of blood while the average adult female has 4-5 liters. Blood transports oxygen and essential nutrients to all of the living cells in the body, and also carries waste products from the tissues to the systems of the body through which they are removed.
Updated: 2 hours 29 min ago

Viagra may reduce blood clots after stent surgery

Tue, 07/11/2017 - 07:00
New research suggests stents coated with sildenafil may have a much lower chance of causing blood clotting or artery narrowing than other stents.

Heart palpitations: Causes, tests, and treatment

Sat, 07/08/2017 - 13:00
A heart palpitation means an awareness of the heartbeat that may not feel right, but what are the common causes and complications? Can it be prevented?

Vegetable pigment may reduce inflammation in heart disease patients

Fri, 07/07/2017 - 14:00
Higher levels of lutein, a pigment found in plants and eggs, correlates with lower levels of inflammation marker in patients with coronary artery disease.

Has effective medical therapy made the benefit of ICDs uncertain?

Fri, 07/07/2017 - 07:00
Medication, including beta-blockers, may be so effective in reducing the risk of sudden death in heart failure that the overall benefit of implantable cardioverter-defibrillators (ICDs) may be...

The 10 best heart disease blogs

Thu, 07/06/2017 - 15:00
Heart disease blogs are a useful source of information about the disease, with stories from people with the condition. We have found the 10 best blogs.

3-D-printed models could transform heart valve replacements

Tue, 07/04/2017 - 07:00
A study shows how 3-D-printed heart valve models can predict how well a prosthetic heart valve will fit a patient, which could lower their risk of leakage.

Can shingles raise the risk of heart attack?

Tue, 07/04/2017 - 07:00
The cardiovascular dangers of shingles are investigated in a new study, providing more evidence that the risk of stroke and heart attack is increased.

Beta-blockers may reverse genetic changes from heart disease

Mon, 07/03/2017 - 14:00
Researchers find that potentially damaging genetic changes linked to heart disease may be reversed with beta-blockers, a widely used class of heart drug.

Heavy breathing: Ten causes and treatments

Mon, 07/03/2017 - 10:00
Heavy breathing can have a range of possible causes. In this article, learn about heavy breathing, why it happens, and how it can be treated.

Why is blood red?

Fri, 06/30/2017 - 07:00
Ring-shaped chemical structures with metal irons produce color. The iron in our red blood cells makes them red, while magnesium makes plant leaves green.

Health insurance expansion via Obamacare linked to fewer cardiac arrests

Thu, 06/29/2017 - 07:00
A sudden catastrophic loss of heart function, or cardiac arrest, occurred significantly less among adults who acquired health insurance via the Affordable Care Act (ACA), according to new research in...

Hospitalizations for heart failure on the decline; disparities remain for blacks and men

Wed, 06/28/2017 - 07:00
The number of people hospitalized for heart failure in the United States declined about 30 percent between 2002 and 2013, but large disparities between blacks vs. whites and men vs.

Asthma history linked to risk factor for heart failure

Wed, 06/28/2017 - 07:00
People with a history of asthma may be at greater risk of left ventricular hypertrophy, the thickening of the heart's main blood-pumping chamber.

Mechanism shown to reverse disease in arteries

Wed, 06/28/2017 - 07:00
A certain immune reaction is the key, not to slowing atherosclerosis like cholesterol-lowering drugs do, but instead to reversing a disease that gradually blocks arteries to cause heart attacks and...

A-fib patients at lower stroke, death risk with early cardiology care

Tue, 06/27/2017 - 15:00
Receiving cardiology care within 90 days of atrial fibrillation diagnosis may lower patients' stroke and death risks by up to 11 percent, study finds.

Low-income childhood may affect adult heart health

Tue, 06/27/2017 - 14:00
New study links low income in childhood to increased left ventricular mass and diastolic dysfunction - both tied to cardiovascular disease - in adulthood.

Are current exercise guidelines too demanding?

Mon, 06/26/2017 - 15:00
Fitting in the recommended amount of exercise is a challenge in our busy lives. Are there health benefits associated with doing less exercise? We find out.

Greater emphasis on preventing, treating heart disease in women needed

Fri, 06/23/2017 - 07:00
Women and physicians do not put enough emphasis on cardiovascular disease in women, and a social stigma regarding body weight may be a primary barrier to these important discussions, according to...

What are hemoglobin levels?

Fri, 06/23/2017 - 07:00
What is hemoglobin, and what do high and low hemoglobin levels mean? Learn more about symptoms, treatment, and who is at risk from hemoglobin imbalances.

Humans retain genes for coronary artery disease because they make for more prolific parents

Thu, 06/22/2017 - 18:00
Genome-wide scans suggest that natural selection keeps these genes in the population as they benefit childbearing capacity.

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