Well, I'm even more confused now - I went into the vet's today to hand in my insurance form and spoke to one of the vets (not one that knows Harvey) as they had telephoned and left a message for me yesterday.
They got the results and they're saying it's not congestive heart failure but something to do with the lympths (I can't remember the fancy name they gave for it) and that he'll have to go to the vet school for an operation as they can't do it because they have to open up the chest. I'm getting conflicting information from the vet and cardiologist to the point where all I know is there is fluid around the heart and he's not a well boy (not that you could tell that from looking at him).
So, the vet is going to speak to the cardiologist, sort it out between themselves and call me on Monday to give a further update. If they don't know what they're doing, how on earth am I supposed to understand.