It seems the only solution to heart worms is an injection of Immiticide or arsenic from what I've read. That's certainly dangerous enough it itself. She mentions to be sure to get the vet in early Spring to do an antigen test, which shows any adult heart worms. A link was provided to study further this topic.
http://www.danebytes.com/heartworm.htm
Between work, trying to figure out this new digital camera, recently downloaded e-books, four new books I bought at Borders, and all the great info on this forum, my mind is about to go into an overload condition!