1. why is the first hour of a heart attack the most critical

Explanation:

The first few hours after the heart attack begins is the critical period, in this period, literally every second counts, and the quicker the blood flow restored and the treatment instituted, the better the chances of survival, and the better the chances of keeping the heart muscle alive. Ive never had one  and hope noone ever does.. please be safe

The first few hours after the heart attack begins is the critical period, in this period, literally every second counts, and the quicker the blood flow restored and the treatment instituted, the better the chances of survival, and the better the chances of keeping the heart muscle alive

Explanation:

this is a good question! i'll do some research and come back when i have the answer!