I reference my heart issues here from time to time, so it's no secret that this is a very real possibility for me. Also one of the main reasons I hobby so infrequently, because the medications I take to not stroke out have certain side effects that are non-conducive to party time. It takes planning to come off the medications long enough for them to clear out of my system. Even more of a risk of having something happening.
On a personal level, I would hope that at least the paramedics would be called. I have a living will that no extraordinary measures be taken to keep me alive longer than what it takes to harvest what they need out of me. It's really of no consequence to me what story is concocted, there is really nobody in my personal life that I am concerned with finding anything out, mainly just professional concerns. Me dropping dead in a hookers bed might get back to the folks at work, but hell at that point, I'm in the clear anyway. If I stroke out or have a heart attack, and survive it, I'll tell the truth; I went off my meds to bang some broad.