The New England Journal of Medicine released a study recently that showed that heart attacks in hospitals are more often fatal than for people who have heart attacks elsewhere.
The study goes so far to say you would be better off to have a heart attack in a hotel or casino than a hospital. The reason is the delay. In a casino, the staff usually responds more quickly and uses a newer, smaller defibrillator which works well. Many hospitals rely on an older, clumsier defibrillator and they are dealing with many other patients, so the delay in responding to you may be a life threatening three, four or five minutes.
ABC News report is here.