Heart Health Archive

Screening for lung and breast cancer may reveal information about the health of your heart's arteries.

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Screening tests for two of the most common forms of cancer involve detailed x-ray images of the chest. Growing evidence suggests that these tests — chest computed tomography (CT) scans and mammograms — may also offer clues about a person's risk of heart disease.

"Both doctors and their patients should be aware that the low-dose CT scans used to find lung cancer can also detect plaque in the arteries of the heart," says Dr. Ron Blankstein, a cardiovascular imaging specialist and preventive cardiologist at Harvard-affiliated Brigham and Women's Hospital. CT scans take a series of rapid-fire x-rays in seconds. Combined, the images allow doctors to "see" structures inside the body.

Research we're watching

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The ancient, mind-calming practice of meditation may have a role in reducing the risk of heart disease. So says a scientific statement from the American Heart Association in the Sept. 28, 2017, Journal of the American Heart Association.

Experts reviewed dozens of studies published over the past two decades. The results suggest that meditation may improve a host of factors linked to heart disease, including stress, anxiety, depression, poor sleep quality, and high blood pressure. It may also help people stop smoking. An added bonus: it's low-cost and poses no apparent risk.

Research we're watching

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Noshing on a handful of nuts on most days of the week has been linked to a lower risk of obesity and heart disease. New research may help explain why: walnuts appear to activate a brain region involved in appetite and impulse control.

For the study, nine people with obesity drank a smoothie that contained about 14 ground walnut halves or a placebo smoothie (identical in taste and calories) for five consecutive days. After a month on their regular diets, the participants returned for another five days, during which the placebo group drank walnut smoothies and vice versa. On day five of both periods, they underwent brain imaging tests while looking at pictures of desirable foods (such as burgers and cake), less desirable foods (vegetables), or neutral pictures of rocks and trees.

Your body depends on the mineral potassium for many bodily functions, including keeping control of the electrical balance of your heart, metabolizing carbohydrates, and building muscle.

Low potassium levels can cause muscle weakness and heartbeat irregularities. On the other hand, too much potassium can cause your heart to stop.

It may help prevent a heart attack or stroke, but it comes with the risk of bleeding.

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Maybe you've heard about people who take a low-dose aspirin each day to ward off heart problems. Since aspirin is a medicine you've probably used now and then without a problem, and since it is available without a prescription, you might consider trying a daily low-dose aspirin yourself. Don't do it. Unlike deciding to take a multivitamin, taking a daily aspirin isn't something you should decide to do on your own.

Aspirin therapy is typically prescribed to people who have atherosclerosis of the arteries of the heart or brain, or risk factors for such disease. Just who should take a daily aspirin, how much aspirin, and what type of aspirin are hotly debated issues, with clinical trials under way in search of answers. "Until those results are in, you should talk to your doctor before starting aspirin," says Dr. Deepak Bhatt, a cardiologist and the editor in chief of the Harvard Heart Letter.

Even if you exercise regularly, sitting for long periods during the day is unhealthy for your heart.

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On average, we spend more than half of our waking hours sitting down: working at a computer, watching television, traveling in a car, or doing other sedentary things such as reading or chatting with friends. But long stretches of uninterrupted sitting have a range of undesirable effects that may harm your heart, says Dr. Beth Frates, who directs wellness programming for the Stroke Research and Recovery Institute at Harvard-affiliated Spaulding Rehabilitation Hospital.

"Sedentary behavior affects your body in many different ways, even down to the molecular level," she notes.

Ask the doctor

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Q. I heard my cardiologist say to another doctor that I have a "full metal jacket." What does that mean?

A. Cardiologists use the term "full metal jacket" to refer to a long series of stents in one of the heart's three major arteries. Stents are tiny metal cylinders, often with drug coatings, that help prop open arteries to restore blood flow to the heart. They're placed inside arteries during an angioplasty, in which a doctor snakes a thin, flexible tube (catheter) through the blood vessels to a narrowed section. A deflated balloon at the tip of the catheter then inflates, pushing fatty plaque against the artery wall and expanding the stent.

Ask the doctor

Q. My doctor added metoprolol to the diuretic medication I'm taking for my high blood pressure. Ever since then, I've felt more tired than usual, and my wife says I seem a little depressed. Could the new drug be to blame, and if so, is there anything I can do about it?

A. Metoprolol (Lopressor, Toprol) belongs to a class of drugs known as beta blockers. These drugs — which make the heart beat slower and with less force — used to be given as a first-choice treatment for high blood pressure. But they can cause fatigue and depression in some people, as well as other side effects, such as erectile dysfunction.

Because many factors are involved, make sure your doctors talk to each other if you need an invasive test or procedure.

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Millions of people with cardiovascular disease take drugs that help prevent blood clots, which can lodge in a vessel and choke off part of the blood supply to a leg, a lung, or the brain. These potentially lifesaving medications, known generally as anticoagulants, include warfarin (Coumadin) and a class of drugs called non–vitamin K antagonist oral anticoagulants, or NOACs (see "Anti-clotting drugs: The old and the new").

However, if you're taking one of these drugs and need an invasive procedure — anything from a tooth extraction to a hip replacement — managing the risks can be tricky, says cardiologist Dr. Gregory Piazza, assistant professor of medicine at Harvard Medical School. "There's a higher-than-normal risk of bleeding during and after the procedure, because your blood doesn't clot as easily," he says.