When someone goes into cardiac arrest outside of a hospital, time is critical: The chance of survival decreases about 10% with each minute. The first step–recognizing that it’s cardiac arrest, when your heart fully stops–is challenging for emergency dispatchers on the phone, who have to make sense of symptoms relayed by a panicked friend or relative. In Copenhagen, dispatchers now have help from AI. If you call for an ambulance, an artificially intelligent assistant called Corti will be on the line, using speech recognition software to transcribe the conversation, and using machine learning to analyze the words and other clues in the background that point to a heart attack diagnosis. The dispatcher gets alerts from the bot in real time.