With rgds to any existing heart condition, whatever it is, the guy has a Class 1 medical so it has been assessed as OK for him to command 747. Numerous days in prison, with all the protracted stress that might bring is, I would suggest, a different matter.
Not really for this forum to speculate nor much room for further debate on that issue is there?
Heart bypass ops are almost routine these days and there are plenty of very healthy people out there who have had it done.
A relative of mine, who had one several years ago, says he wishes he had it much earlier as he has never felt fitter.