Oh Jezebel. That will have come as unwelcome news, but try not to worry.
Paddy had a heart murmur for the last 5 years of his lifem, and it gave him little trouble.
They're graded on a scale from 1 to 6, with 1 being the least troublesome.
Most of them don't need to be treated. Paddy's certainly didn't, and his was a grade 3. It meant we had to be really careful in terms of anaesthesia, so dental work became a bit of an art form, with our dentist removing chunks of plaque from rear gnashers with a practised finger, rather than putting him under.