A smartphone app can detect a serious type of heart attack almost as well as an EKG! The Kardia mobile device from Alivecor uses a two wire attachment to take an electrocardiogram.
That's immediately sent to a cardiologist. Researchers in Utah tested the app on about 200 patients who were having chest pain. The device was nearly as accurate as a standard EKG. In identifying a stemi heart attack which can be fatal without quick treatment.