The heart is a muscle, and portions will die off depending on where the blockage is. These sections do not recover.
Always call 911 and get an ambulance response. An ambulance is a hospital on wheels, and can provide much more immediate care to increase the possibility of a good outcome.
I am reading this laying in my hospital bed after open heart surgery. My problem was I was born with a bicuspid aortic valve that started leaking badly resulting in an arotic aneurysm. I had to have the valve and ascending aorta replaced. I am 9 days post-surgery and will likely go home tomorrow. The article gives me encouragement.
Good reminder. That’s what the paramedics always tell us when we take the Cub Scouts to the Fire & Rescue station.