Can the after effect of a cardiac arrest affect your thinking power?

Yes: During a cardiac arrest, there is not blood flow, and thus oxygen to the brain. Even is someone survies, they may have brain damage. At times it can be minor, but may have an affect on someones memory, congnition, personality.

Sometimes: It depends on the time that the brain did not get blood flow. It is the reason hypothermia for cardiac arrest that is prolonged in an effort to slow down brain metabolism and preserve function.

Absolutely: The brain can be stunned from the lack of adequate blood supply during the arrest. Impaired thinking is frequent following an arrest. Protective strategies include cooling the body to protect the brain after an arrest.