Quick -- you're watching House, M.D. with a friend and he suddenly complains of lightheadedness and heart palpitations, then passes out on your couch. Is it a common atrial fibrillation, or is it a third-degree atrioventricular block needing emergency atropine and an electrical pacer?
Soon, assuming you're either a medical professional skilled in electrocardiography or you play one on TV, you'll be able to make the differential diagnosis using just an iPhone 4 and the AliveCor iPhonECG.
