Emergency Health Care

Now that I'm older, what does one do if they have a medical emergency? I spent time in Zihua from 1988 to 2005 but haven't been back for various reasons but miss it very much. The best place to vacation in my mind. Loved everything about it. In a past post Rob you suggested not visiting Zihua if you have any health concerns. While I don't have current medical problems. If, let's say one has an MI, stroke or is in a major car accident with multiple injuries, is their a hospital/medical center that can successfully treat this like in the US or other western countries that have updated medical treatment guidelines?