That's only 4.6 per minute so it's not bad considering her history. The good news is that she is getting the million dollar work up to make sure she is O.K. They will make sure that she has no other considerations that would cause any concerns. Most of the time PVC's in and of themselves are benign. Many healthy children (and adults!) experience PVC's. In children PVC's tend to decrease in frequency as they get older. What they are doing now is making sure that the PVC's are normal and not occurring in combination with some other heart problem.
I'm thinking that in time you will look back on this with the knowledge that this is normal for her and her current stage of development in light of her medical history and that you will be reassured that she was looked at so thoroughly and that everything else was ruled out.
For the rest of you: PVC=Premature Ventricular Contraction of the heart. The heart has an electrical conduction system that follows a set nerve path way. This nerve generated, electrical impulse causes the heart muscle to contract in an orderly fashion. The individual cells of the heart also have the ability to provide electrical impulses outside of this nerve pathway. These cellular impulses can cause ill timed contractions. If the rouge impulse originates in the ventricles of the heart it is called a Premature Ventricular Contraction. Perfectly healthy people experience these PVC's without problems as a part of the normal functioning of the heart. However, sometimes these PVC's may be occurring because of other problems that the heart is experiencing. Tests are done to check for other problems and to make sure that the PVC's are just the normal everyday ones and not ones that are indicating that there may be other problems with the heart.
Good luck and I shall keep my ventricles crossed for you that everything works out just fine.
~NM