Heart palpitations are usually harmless, but a rare condition of irregular heartbeat, or arrhythmia, known as Wolff-Parkinson-White syndrome, could cause problems.

Both of these tests are used to gather more information about how your heart is acting. For a Holter test, you'll wear a small device, usually for a day or two. It keeps track of your heart's rhythms.

Study by scientists at deCODE genetics/Amgen and collaborators in Denmark and the USA, on the genetics of accessory conduction pathways in the heart (Wolff-Parkinson-White syndrome), reveals that ...

The concern is whether, during those long minutes before Mr. Hamlin’s heart rhythm returned, when his heart was not pumping normally, a lack of blood damaged his brain, heart experts said.

A brisk walking pace, and the amount of time spent at this speed, may lower the risk of heart rhythm abnormalities, such as atrial fibrillation, tachycardia (rapid heartbeat), and bradycardia ...