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Cardiac arrest does the same thing as G-LOC, but if circulation does not resume within minutes, brain cells start to die. First responders use “ambubags”—a mechanical substitute for mouth-to-mouth resuscitation—to force oxygen into the lungs, and chest compressions to force blood through the body. That keeps the brain irrigated with enough oxygenated blood to stave off cell death. At the hospital, doctors shock cardiac victims with a defibrillator, put them on a ventilator to help them breathe, inject them with adrenaline, and finally dut their chests open to try to massage their heart back to life. The survival rate for cardiac arrest is about 10 percent.
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