Glad that things worked out! It seems these day that stents are almost an outpatient procedure. I've heard of others getting the procedure under non-emergency conditions. I've undergone stress tests with a cardiologist, if they are honest they will tell you that there are no guarantees, you can test OK one day and die the next.
I've thought about the issue of being remote from facilities, it doesn't matter whether it's Mexico or not. We now winter in California about an hour from hospitals that can handle an emergency like that. I've thought about buying an AED but it probably wouldn't help with the blocked arteries. I guess you take your chances and hope for the best.