A premature ventricular contraction occurs when a focus in the ventricle generates an action potential before the next scheduled sinoatrial nodal action potential. Premature, occurring earlier than ...

Premature ventricular contraction (PVC) is a type of abnormal heartbeat, or arrhythmia. It happens when the heartbeat begins in the lower, rather than the upper, heart chambers. This creates an ...

In most cases, you can exercise at full capacity if you only sometimes experience PVCs. You may need to reduce the intensity if you often experience PVCs or have an underlying heart condition.

ATRIAL fibrillation, commonly referred to as AFIB, is the most common sustained cardiac arrhythmia (abnormality of heart rhythm) worldwide. AFIB accounts for a significant burden of symptoms, ...

Atrial fibrillation is a heart disorder that causes the upper chambers of the heart to spasm instead of beating regularly. While that sounds dangerous, the lack of a regular heartbeat itself isn’t ...

Heart disease — the leading cause of death in the U.S. — is so deadly in part because the heart, unlike other organs, cannot repair itself after injury. That is why tissue engineering, ultimately ...

Severe hypothyroidism is associated with a high burden of systolic/diastolic ventricular dysfunction and myocardial deformation abnormalities.