Premature ventricular contractions .
Premature ventricular contractions (PVCs) are extra heartbeats that begin in one of your heart's two lower pumping chambers (ventricles). If you have frequent premature ventricular contractions or underlying heart disease, you might need treatment. Premature ventricular.
If you get PVCs once in a while, you may feel like your heart The two on top are called atria, and the two on bottom are called ventricles.