Brain anoxia and reperfusion iojury?

I have come to know the following happens during a cardiac arrest. 1) Anoxia during cardiac causes exitotoxosis due to the ischeamic cascase. This is evident here... http://en.wikipedia.org/wiki/Ischemic_cascade So why are there no covulsion during a cardiac arrest no matter how long it lasts? 2)... show more I have come to know the following happens during a cardiac arrest.

1) Anoxia during cardiac causes exitotoxosis due to the ischeamic cascase.
This is evident here... http://en.wikipedia.org/wiki/Ischemic_ca...
So why are there no covulsion during a cardiac arrest no matter how long it lasts?

2) Reperfusion injury where reoxygenation starts using the built up glutamate store in the brain to over-exite the brain.
This is evident here...
http://en.wikipedia.org/wiki/Reperfusion...
But I do not hear much about patients convulsing then.

They may be having a very long form of atonic convulsions during cardiac arrest or reperfusion injury, but how would we know?
http://en.wikipedia.org/wiki/Atonic_seiz...

Do you know if they do, and if they do not why, because reading all the stuff it says about ishemic cascades, it does not add up with what really happens to cardiac arrest patients.
What is it that I am missing here, explain in detial?

CREED
2 answers 2