Apple Wants To Capture Your Heart

Apple, always the innovator, is looking for the key to your heart. Security is a major concern in computing, particularly with smaller mobile devices becoming more capable. Apple thinks it has the answer. The patent describes a method of detecting an authorized user by the pulse in the veins and arteries in the hand holding the device. A sensor built into the device would detect your heart rhythm, apparently as unique as a fingerprint or retina. Other uses have been suggested, such as mood detection or managing user profiles. I’ve not heard much about cardiac signatures before, but this strikes me as a more convenient solution than entering passwords, and far less hokey than the idea of holding up your eye to the camera for a retina scan. What a ‘handy’ way to solve the security issue. Source: Unwired
I jumped on Wikipedia and read the article, but it was a lot like walking through pudding: slow going and afterward I felt kinda dirty.
Ok but what about a stress situation or think of an emergency. In an emergency case my heart would beat much faster and will i be able to unlock the phone to call a doctor or the police?
Interesting to say the least, would actually like to see this put into motion so that it would actually only work for a single user.
This would be awesome if they get it to work