Like Bromley said, your heart is throwing extra beats from one irritable spot in your ventricles. As long as your heart is structurally normal, the extra beats are considered benign. Did you have an echocardiogram?
If you read through the forum posts, you'll find that PVCs (and PACs) are very common. The can be annoying and bothersome, but are usually not indicative of anything serious. The key is knowing whether you have a structurally normal heart. Fortunately, they are most often benign. Keep us posted and take care.
It is difficult to say actually. I dont really know, but the terminology almost seems to suggest that you have a single focus in the lower heart which is the origin of your premature beats. It does not seem to describe the nature of your symptoms or the severity of your condition. Did you ask your doctor?