Once heart stops how long is it until brain damage occurs?

Answer 1

There are a lot of variables, but 4 minutes is the usual guideline. Blood carries oxygen, and blood is pumped by the heart. Brain damage occurs after 4 minutes without fresh oxygen to the brain.

Answer 2

Brain damage starts after 10 minutes, after that you risk serious permanent brain damage. All brain surgerys that require stopping the heart are done in 10 minutes or less.

Answer 3

after about 4 minutes unless his body temp is really cold then the rate of breakdown is reduced

Answer 4

Once a heart stops it takes up to 6 minutes before permanent brain damage can occur. This is because the brain has been starved for fresh oxygenated blood and was not being nourished.