It is actually difficult, even if now less so, that practicing Cardiology research leaders apply their knowledge to design smartphone apps and these two worlds have been kept separated for way too long.

There is still room for lifesaving invention in our era..apparently dedicated only to gaming..

One needs to understand exactly what a sudden cardiac arrest is to be able to conceive how to detect it through commercial low-cost devices, such as a bluetooth chest strap heart monitor, exploiting all the huge data analysis capability typical of smartphones. Cardiac arrhythmias are generally monitored in the ICU through complex 12-lead cabled monitors which can analyse ECG tracings. A heart rate chest strap only uses heart rate and this poses a difficult task to less thoughtful researchers. Exercise poses also a challenge with its many muscular and motion artifacts which can falsely simulate abnormalities based on heart rate only. Our team's "egg of Columbus" was putting the two methods together, reducing each downside, i.e. heart rate analysis (a very sensitive method for arrhythmia detection when our patent-pending algorithm is applied) and motion (very specific) to strengthen each other. Motion is almost continuously present during exercise, while the  characteristic of an unconscious subject in cardiac arrest is the total absence of motion after few seconds.