Hi. Very interesting project. Also very known in WBAN (Wireless Area Body Networks) Systems. WBAN systems are studied first with WSN (Wireless sensor networks) like arduino’s XBee modules + Arduino microcontroller + PC. First is correctly to study the arquitecture of the system, and then insert the ECG (Electrocardiogram) sensor.
This WBAN system needs three things:
ECG Sensor (In order to get the Heart Beat) It may be in a "sleeping wrist"
Coordinator Node (Wich will take every information and collect them intelligently)
a Microcontroller (Also may it be a Tablet/Phone)
an AP… like a Router wich will send the information to Internet pages or softwares in Clinical Ambulances and Doctor’s PC.
Actually Im working in a fECG (fetal ECG) implanted sensor, so I can help with everything I have.
Great Project !