Cardiac Arrest

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

Obtaining
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
You gain +50% poison resistance, +50% bonus to healing items and robots have -25% critical chance against you.

Glitches
According to GECK, this perk actually made enemy robotics has -50% Critical Chance (not -25% in description text)

Behind the scenes

 * Cardiac Arrest shares the same Vault boy image as Heartless.