Yes .. but my FIL didn't go because of a checkup .. he had a heart attack
My guess is that is what happen with Clinton
Similar to what happened to my MIL just last week. She had been having problems, and a friend was supposed to pick her up to take her to the doctor for a scheduled appointment to find out what the problem was.
But she started having an attack at home that didn't go away. Her friend took her straight to the nearest doctor's office, where they hooked her up to an EKG, found a problem and called an ambulance.