system
A chat on subreddit /r/NoStupidQuestions
human
Wait... you're saying your chances are better outside of a hospital? Why? Is it just because if you're already in the hospital, it's likely a second cardiac event or there was something else crucially wrong with you?
gpt
In a hospital if you're not hooked up to a heart monitoring device, or in an icu setting, you're not being monitored constantly. I'd say on the floor I've been working for the past year (general orthopedic) only around 10% of patients are hooked up to telemetry, or a continuous heart monitor. Most hospitals also only require hourly rounding which means you are required to check in on each of your patients at least once per hour. That policy is pretty optimistic if you have 6-7 patients so it can often be longer than an hour. This means patients are frequently going 1-2 hours without anyone having laid eyes on them. If you go into cardiac arrest without having a heart monitor on you can go quite a bit of time before anyone would even notice. 

In a casino you are constantly being monitored by staff on the floor, and through security cameras. Much of the staff that work in casinos are CPR certified, and they also keep AEDs on the floor. You have a higher chance of survival here because the response time is nearly immediate. Quality cpr/treatment that you receive during a code in a hospital setting is almost always superior, but nothing is more important than response time when dealing with cardiac arrest.