Their high calcium content is usually the star of the show, but donât let it blind you to everything else in the can. 1  Sardines also deliver: 2  Selenium (69%) 3  Phosphorus (45%) 4  Iron (15%) 5  Magnesium (9%) 6  Copper (9%) 7  Zinc (8%)
Premature ventricular contractions (PVCs, PVC) are premature heartbeats originating from the ventricles of the heart. Premature ventricular contractions are premature because they occur before the regular heartbeat. Normal function of the heart. The heart has four chambers.
Premature Ventricular Contractions. Premature ventricular contractions (PVCs) are a type of arrhythmia (irregular heartbeat). They are common and can affect people of all ages. PVCs are often not dangerous. But if other heart problems are present, PVCs can cause serious health issues. This sheet tells you more about PVCs and how they are treated.