I remember when you were having problems with the dialysis job you had before, I feel your pain now. Can't recall if you were in acutes or not. I would be very tempted to take a job in dialysis, if I were in your shoes. But, I would request to shadow at the outpatient clinic for a day. You will get an idea of how they operate, before you jump back in.
I have done both acute and chronic dialysis for a loooong time, Acutes was never my thing because of all the overtime, etc. that went into it. My first Dialysis job was in chronics, and that's where I want to stay. Sure it's busy, but in a different way, the best thing is, you can lock the doors at night, and not worry about "That Darn Beeper!"
If indeed they did misrepresent this job, I would have no qualms in leaving it, and letting them know why!
If you interview for the dialysis position, I would just say the Re=hab job was misrepresented.
Good Luck in whatever you decide to do!