If you are worried about a friend or a relative who might be alone when an emergency occurs, keep your eyes on this App - which currently in beta testing.
The app, dubbed Medlert, is designed for the elderly and people with chronic illness, who may be alone in the event of an emergency.
http://venturebeat.com/2013/07/03/an-app-to-save-lives-medlert-is-the-fastest-way-to-get-medical-help-exclusive/
Consumers download the iPhone and Android app, and tap the icon on their homescreen when symptoms strike. Patients will then get connected with a trained operator who is already aware of the full medical history, including blood type, pre-existing conditions, drug allergies, and family-members are automatically notified.
An ambulance is immediately dispatched to the patient’s location to take them to the nearest hospital.