Many present with chest and back pain. If unstable when they arrive, vast majority don’t make it. If reasonably healthy, and stable, about 85-90% survive if cardiac surgery available for dissections. Most cardiac arrhythmia patients die suddenly, unless if cpr and defibrillators around. Ventricular arrhythmia very lethal very fast.
I do not fear heart attack as much as I fear cancer. I can defend heart attack with exercise. Other than not smoking and drinking, there is not much else I can do to avoid cancer. My wife never smoked and was not a drinker, and yet got cancer of lungs at age 64.