AED

"An Automated External Defibrillator (AED) is a portable electronic device that automatically diagnoses potentially life threatening cardiac conditions in a patient - and is able to treat them through defibrillation, the application of electrical therapy that stops the arrhythmia, allowing the heart to re-establish an effective rhythm."

(Paraphrased from the Internet)

Y And to think I was close to making an apathetic joke about this...