Well, how quickly can you make it to a medical facility during a medical emergency? I had a blockage in my left anterior descending two years ago, I recognized the symptoms (which were rather debilitating), and had my nephew call for an ambulance. I only live a few miles from the local hospital, and it took about ten minutes for the ambulance to arrive, another five or so for them to do an EKG, and about five to ten to transport to the hospital. Another few minutes to prep the ER for an x-ray, and a few more minutes to put in a stent (through the groin- didn't feel a thing after they drugged me up- and shaved off everything below the waist, lol). Over all, not a fun process, but I was optimistic about my survival from the start. The EMT's and medical team were top notch. Med techs said I made it by about ten minutes.
No heart damage, and I still keep active playing basketball, and working out at the gym.
Added- The ICU was hell, couldn't wait to get out of that place (many patients were elderly, and pretty bad off).