I'm sorry. I also meant to mention that you might like to try the heart rhythm forum...
I hope that you are feeling better. I don't know if you are familiar with ventricular Tachycardia. It sounds as though you may have suffered from nonsustained (less than 30) PVCs in a row. If they originate from same place and look the same on EKG, I believe they are unifocal. If they originate from various areas of ventrial and vary on EKG, they are considered multifocal ( also complex, i believe)
I have suffered from a few attacks of these myself. I have just begun to try and be informed so I am limited in my info. Since no one has answered as of yet, I thought that you might find this helpful. Google Cardiac Ventricular Tachycardia, if you like, and you may find that helpful.
Best of luck to you...