Atrial fibrillation occurs when action potentials fire very rapidly within the pulmonary veins or atrium in a chaotic manner. The result is a very fast atrial rate — about 400 to 600 beats per minute.

Primary repolarization abnormalities such as ST or T wave changes are associated with higher risk of CHD mortality; however, the prevalence of primary repolarization abnormalities is low and their ...

Apple's new, fourth-generation watch has an electrical heart rate sensor. This can record your electrocardiogram or ECG, which Apple says: "… can classify if the heart is beating in a normal pattern ...

Regular physical exertion results in physiological electrical, functional and structural cardiac adaptations. Such changes have been most extensively documented in individuals participating in ...