In addition to heavy dialysis, he has to take some kind of stimulant to boost his physical outlook, at least for a few hours.
The more frequent he has to show up at public gathering for extended period of time, the worse his health becomes. If he drinks or smoke a lot at these gatherings, it is even better (for us.) Everytime I hear Kim Jong-il drink hard liquor or drink for hours, I tend to smile because the guy is lopping off months or even a year off his life when he does that.