Cardiac Arrest

Cardiac Arrest is a special perk in the Fallout: New Vegas add-on Old World Blues.

Location
Convince your brain to return to your body or convince it to come back to The Sink. After, you can have your heart reinserted into your body. This perk replaces Heartless.

Effects
+50% bonus to poison resistance and healing items respectively, plus -25% to critical chance for robots against you.

Bugs
This perk grants -50% critical chance from enemy robots, rather than the listed -25%.

Both Cardiac arrest and Heartless do not affect healing from any items as they are missing the correct modifiers.

Behind the scenes
Cardiac Arrest is the result of the heart failing to pump blood effectively enough to maintain body functions. Unlike Heartless, the title of the perk cannot be interpreted literally, as the new technologies remaining in the heart improve heart function, contradictory to the title.