I went for my 3 monthly heart scan last week, I continue on herceptin. I had to stop for 4 weeks as my cardiac output dropped to 44% . It was rechecked in a month and back to 58% ...but better method ...
He did say before only normally stop at 40% and since no symptons hopefully he will say go ahead and retest in a month (its 300 km to do it! Which is a damn nuisance)