PACs (premature atrial complexes) are extra beats that arise from the atria. PVCs (premature ventricular complexes) are extra beats that arise from the ventricles. They can occur in either a normal heart or a diseased heart.
Though most patients have no symptoms associated with PACs and PVCs, some patients can be quite symptomatic from them. If PACs require treatment, usually medication is used to suppress them.
PVCs can be more troublesome than PACs, especially as they can cause weakening of the heart function over time in some cases. Besides medications, cardiac ablation can also be considered in certain patients with PVCs.