Heart Health Archive

Some panic attack symptoms—a racing heart, breathlessness and dizziness—overlap with supraventricular tachycardia. This heart rhythm disorder occurs when faulty electrical signals trigger a series of very fast heartbeats.

In the journals

Can you be "fat and fit" — that is, overweight but still healthy because of regular exercise? There is no simple answer. But one study says that activity does not entirely reverse the effects weight has on heart health. The findings were published online Jan. 26, 2021, by the European Journal of Preventive Cardiology.

The study involved more than 527,000 adults, almost 70% of whom were men. People were placed into three groups based on their body mass index (BMI): normal, overweight, and obese. They also were grouped by activity level: regularly active (the minimum requirement from the World Health Organization, or WHO); insufficiently active (less than the WHO minimum, but some moderate to vigorous physical activity every week), and no exercise.

Research we're watching

A minimally invasive treatment for treating varicose veins is as effective as surgery to remove the faulty veins, according to a new study.

Most varicose veins — gnarled, bluish veins just under the skin's surface — result from problems with the great saphenous vein, the large vein located near the inside of the leg that runs from the ankle to the upper thigh. The surrounding muscles and one-way valves in the vein weaken, a condition called venous insufficiency.

Research we're watching

If you're a fan of TV medical dramas, perhaps you've seen a doctor try to restart a patient's stopped heart with a single, firm whack to the chest. But this technique, known as a precordial thump, is neither effective nor safe outside the hospital, according to a report in the Feb. 11, 2021 issue of Resuscitation.

Researchers examined data from 23 studies that looked at the effectiveness of the precordial thump and two other uncommon cardiopulmonary resuscitation (CPR) techniques. One, known as percussion pacing, entails less forceful, repeated strikes to the chest. The other, called "cough CPR," is a misnomer because coughing is impossible if you're unconscious. The idea (which is periodically perpetuated on social media) is to cough forcefully and repeatedly during a heart attack to prevent a cardiac arrest.

Research we're watching

People who have an implantable cardioverter-defibrillator (ICD) or pacemaker should avoid the iPhone 12 as well as wearable tech products — such as the Fitbit and Apple Watch — that use magnetic chargers. The magnets in these gadgets can interfere with implanted cardiac devices, possibly rendering them useless, say two recent reports.

A 55-year-old woman wearing an Apple Watch while sleeping was awakened by several beeps from her ICD. A next-day check showed the watch's magnet had deactivated her device, as noted Dec. 12, 2020, in HeartRhythm Case Reports. In the Jan. 4, 2021 HeartRhythm, doctors described how bringing an iPhone 12 near the chest of a person with an ICD immediately disabled the device.