prognosis for heart failure?

[rosemary]

I was on Herceptin from May 2007-April 2008.On March 19 I had a Muga scan which put my LEF at 49. My onco scheduled a chest x-ray which would have caught any major heart damage 8 weeks later. Five weeks after the MUGA I went into the hospital with congestive heart failure and a LEF (by echocardiogram) of 15-20. During that time I also had a respritory virus which may have contributed to the heart failure because everyone onco,cardiologist, oncology nurses tell me that things should not have gotten that bad that fast. It's July and my LEF is between 25-30. I know I am still getting better, I can feel it, but my big worry is will this come back later. Nobody knows around here where I am the third case they have had. Is Herceptin too new to know long term prognosis ?