Dave needs to answer that question, but I understood that he basically hadn't had any problems with his heart for quite some time before the trip.
As far coverage for pre-existing conditions in general, that is something that you really need to look at the individual policy very closely. This is where Insure My Trip is very helpful, because you can compare policies side by side. There are SOME policies (which cost more, of course!!) that do cover pre-existing conditions, even if not booked within a very short period of time of booking. So if one specifically needs pre-existing condition coverage, Insure my Trip is invaluable for comparing policies. As far as Sky Med coverage of pre-existing conditions specifically, I don't know what it is. And, as a reminder, if you book through the links here on TTOL for Sky Med or Insure My Trip, it doesn't cost YOU any more, but we get a small commission.