Heart Health Archive

Spending less time sitting and more time standing lowers blood sugar, cholesterol, and weight — all of which translates into a lower risk for heart disease. So says a study of Australian adults published in the July 30 issue of the European Heart Journal. Every two hours a day spent sitting was associated with an increase in weight and waist size, as well as in levels of blood sugar and cholesterol. As you might expect, time spent walking rather than sitting not only lowered cholesterol and blood sugar levels, but also reduced waist size and weight. Simply substituting two hours of standing for sitting also improved blood sugar and cholesterol levels. By making slight changes in your lifestyle to incorporate more standing, you could add important health benefits.

Q. My pulse is usually on the fast side. Does a high heart rate mean I have a problem with my heart?

A. In otherwise healthy people, I don't usually worry about the heart rate unless it is consistently above 100 beats per minute at rest. Heart rates that are consistently above 100, even when the patient is sitting quietly, can sometimes be caused by an abnormal heart rhythm. A high heart rate can also mean the heart muscle is weakened by a virus or some other problem that forces it to beat more often to pump enough blood to the rest of the body.

Ask the Doctor

Q. I've had a pacemaker for several years. Does it make sense to replace it with a newer model that is safe during an MRI scan?

A. Your concern is valid, given some estimates that many people who currently have an implanted cardiac electronic device will need magnetic resonance imaging (MRI) during their lifetime. Sometimes, computed tomography (CT) scans can be used instead. But MRI is the gold standard for diagnosing certain diseases of the brain and spinal cord.

A novel class of drugs has the potential to pick up the slack where other cholesterol medications leave off.

Research suggests benefits for a range of cardiovascular conditions.

Even if you don't have symptoms, repairing the valve sooner rather than later may be a wise choice.

The four valves of your heart work like one-way swinging doors, opening and closing in a perfectly timed sequence to propel blood through your heart and the rest of your body. But the leaflets (flaps of tissue that make up the valves) and nearby structures don't always function as they should. Perhaps because of the higher pressures in the heart's left side, the valves there are particularly vulnerable to problems. That includes the mitral valve, which separates the left upper and lower chambers of the heart (see illustration).

The types of fat and other nutrients found in plant- and animal-based protein foods should guide your choices.

A diet rich in polyunsaturated fats—found mainly in vegetable oils and fish—seems to protect people against cardio-vascular disease. A new study that measured blood levels of these fats in older adults now lends further support to this observation.

The report, in the June 17, 2015, Circulation, included more than 4,200 Swedish men and women without heart disease who were 60 years old when they joined the study. Researchers then tracked the participants' deaths over the following decade and a half. People with the highest blood levels of these beneficial fats were less likely to die from heart disease or any other cause than those with the lowest levels. Measuring the blood levels of these fats may be more reliable than asking people to recall what they ate, the researchers note.

A noninvasive test called a coronary artery calcium (CAC) scan, which measures specks of calcium in the heart's arteries, can help predict a person's risk of heart disease. New research suggests that a CAC score (which ranges from 0 to 1,000 or more) also can accurately predict a person's risk of dying over the following decade and a half.

The study included 9,715 people who were referred to a cardiology clinic and underwent CAC scans. All had risk factors for heart disease (such as high blood pressure, diabetes, or a family history) but no symptoms. During the nearly 15-year follow-up, people with scores of 400 or greater had a 20% risk of dying of any cause. By comparison, the risk of death was only 3% for people with no signs of calcium in their arteries (a CAC score of 0).

A constant drone of low-level traffic noise may slightly raise your risk of cardiovascular disease, according to British researchers.

The study included data from the nearly 450,000 people admitted to London hospitals with cardiovascular disease over an eight-year period. Researchers estimated how much traffic noise these people were exposed to, day and night.