He did indeed.He had electrical rhythmn reversion therapy for SVT. And the only reason we know that is because his medical condition was reported publically. I doubt he explicitly gave permission for that either. Both the condition and the treatment were reported publically and no fuss was made about that as I recall.
The difference there is that Tony Blair was a celebrity, and was in charge of the country. His heart condition was fairly minor, and if they hadn't gone public then a lot of people (stock-markets etc) may have assumed that the problem was something much more serious.
On the other hand, just prior to the Iraq war I thought he looked absolutely on the edge, to the extent that he should have been discussing his state of mind with doctors. Even when you're prime minister, there are things that you choose to share... or not.