Wow, that's a frightener.
This Dutch guy I climb for occasionally phoned me up to cancel a job, said he'd had an episode and collapsed, turns out he'd had a burn out and his heart had gone wonky, stress etc.
He said to me "I always thought this sort of shit was for weaklings" he's a tough guy.
I kind of sensed that something like that might happen, he's an intense kind of guy, always putting himself under pressure, as soon as he achieves something instead of sitting back for a bit he does something else, like buying an old ruined house or opening a garden centre.
What's really sad is he must really scale back his business and he would have sold me his chipper, but now I've bought another!