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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: 1 hour 38 min ago

Diabetes: Switching to common drugs raises risk of complications

Thu, 07/19/2018 - 14:00
A new study finds that switching from metformin to sulfonylureas to control blood sugar levels may significantly increase the risk of major complications.

Do omega-3 supplements really benefit the heart?

Wed, 07/18/2018 - 14:00
A major systematic review of clinical trials led by independent researchers finds 'little to no' evidence that omega-3 capsules benefit heart health.

What happens when you get an adrenaline rush?

Tue, 07/17/2018 - 16:00
Certain situations will trigger an adrenaline rush, which is the release of adrenaline from the adrenal gland. This defense mechanism causes an increased heart rate, sweating, and pupil dilation. People can control an adrenaline rush with slow breathing and calming techniques. Learn more about an adrenaline rush here.

E-counseling can lower blood pressure, heart disease risk

Tue, 07/17/2018 - 15:00
New research shows that virtual counseling, when added to medical therapy, lowers high blood pressure and heart disease risk in people with hypertension.

Large study reviews the cardiovascular benefits of walnuts

Tue, 07/17/2018 - 10:00
The results of a meta-review of 25 years worth of research on the cardiovascular effects of nuts are in: a walnut-enriched diet keeps your heart healthy.

Even minor distress puts you at risk of chronic disease

Sat, 07/14/2018 - 07:00
New research finds that you needn't experience high levels of distress for your risk of chronic diseases to increase; low distress levels are enough.

What causes a bounding pulse?

Fri, 07/13/2018 - 23:00
A bounding pulse is when a person can feel their heart beating strongly. They may feel the pulse in their chest, neck, or wrists. This is often caused by anxiety or panic attacks, though in some cases it can signal another medical condition. Learn about the causes, symptoms, and treatments for a bounding pulse here.

Can high blood pressure lead to headaches?

Fri, 07/13/2018 - 17:00
High blood pressure, also called hypertension, has many potential symptoms. These may include back pain, difficulty sleeping, and shortness of breath. Some research also suggests that very high blood pressure can cause headaches. Treatment depends on the causes. Learn more about high blood pressure and headaches here.

Gut bacteria and heart health: Is there a link?

Fri, 07/13/2018 - 10:00
A first-of-its-kind study finds a link between having a healthy heart and having a diverse range of beneficial bacteria in one's gut.

How long does it take to recover from heart bypass surgery?

Thu, 07/12/2018 - 16:00
If someone has a blockage in the heart, they may need bypass surgery to lower the risk of a heart attack. It is the most common heart surgery performed on adults. The operation can take many hours, but the success rate is high. Recovery time varies from person to person but usually involves 1 week in the hospital.

New protein 'regenerates' the heart after an attack

Wed, 07/11/2018 - 14:00
The body's attempt to recover after a heart attack can lead to heart failure. But, researchers may now have found a different way to regenerate the heart.

Multivitamins 'of no benefit' to heart health

Tue, 07/10/2018 - 16:00
A review of 18 studies of 2 million people over an average of 12 years finds no evidence that multivitamin and mineral supplements protect heart health.

Gene editing shown to lower cholesterol in monkeys

Tue, 07/10/2018 - 14:00
In a first-of-its kind study, genome editing is proven to reduce 'bad' cholesterol in large animals. The findings pave the way for human clinical trials.

Blood thinning foods, drinks, and supplements

Thu, 07/05/2018 - 19:00
There are many things that people can eat and drink that may help to keep the blood thin and reduce the chances of dangerous clots developing. These include ginger, garlic, and turmeric. Learn more about 11 potential natural blood thinners, including foods, drinks, and supplements here.

How do you improve poor circulation?

Wed, 07/04/2018 - 21:00
Poor circulation has a range of potential causes, including diabetes and atherosclerosis. Symptoms include numbness in the extremities, digestive problems, and fatigue. Treatment depends on the cause, but quitting smoking and losing weight can help. Learn more about poor circulation and how to improve it here.

What causes chest pain and vomiting?

Tue, 07/03/2018 - 19:00
There are many potential causes of chest pain and vomiting, including gastrointestinal issues and panic attacks. Sometimes, however, these symptoms are an early symptom of a heart attack or another cardiac event in adults. Learn more about chest pain and vomiting in adults and children, and when to see a doctor.

New potential risk factor for heart failure

Tue, 07/03/2018 - 16:00
A study of more than half a million people identifies leg bioimpedance as a new risk factor for heart failure that can be measured noninvasively.

What is a blood gas test?

Tue, 07/03/2018 - 13:00
A blood gas test is also called an arterial blood gas test or a blood gas analysis. Results show blood oxygen and carbon dioxide levels, pH levels, and lung function. Doctors often use the test in emergency situations, when they need to determine why a person is having trouble breathing. Learn more about the test here.

Good news for heavy coffee drinkers

Mon, 07/02/2018 - 15:00
The health benefits of drinking coffee in moderation are now known. However, a new study asks whether the benefits are the same for heavy drinkers.

How to stop heart palpitations during pregnancy

Mon, 07/02/2018 - 11:00
Heart palpitations sometimes occur during pregnancy. It may feel as though the heart is skipping beats. Usually, the causes are not severe, and the palpitations do not require treatment. However, a pregnant woman should see a doctor for a diagnosis to be sure. Learn more about heart palpitations during pregnancy here.