The Nanotrites inside your body do an amazing job of healing you, but when the periphery of the screen turns red, you’re seriously injured. Seek cover and let your Nanotrites do their job. When your vision returns to normal, you are fully healed and ready to return to action. However, the Nanotrites can only work so fast. If they’re overwhelmed by injuries you’ve sustained, you’ll lose consciousness. At this time you’re given the option to revive yourself through the use of an internal defibrillation unit. This initiates a minigame that determines how much health you receive when you’re revived.
The defibrillation process differs slightly between the console and PC versions. In the PC version, two white diamond icons appear on each side of the screen, sliding toward each other. Press the activation key when the white diamonds are lined up with the vertical yellow line in the center of the screen to maximize your health. In the console versions you must first match inputs with the control sticks before the actual defibrillation process begins. At that point, you must match a pair of sliding button icons with a pair of stationary diamond icons to maximize the defibrillator’s electrical output. Regardless of platform, a successful defibrillation can restore your health by as much as 100%. During defibrillation, electricity leaks out of your body and electrocutes anyone standing within a small radius—this gives you a fighting chance once you get back on your feet. It takes several minutes for your defibrillator to recharge, so avoid getting injured in that time. If you become incapacitated while your defibrillator is still charging, you die and must restart from your last save. Bandages can heal you instantly, so keep some selected as a quick use item, at least until your defibrillator is fully recharged.