"The system converts IMEC's ultra-low-power electrocardiogram sensors into wireless nodes in a short-range network, transmitting physiological data to a hub – the patient's cellphone. From there, the readings can be forwarded to doctors via a Wi-Fi or 3G connection." (Graham Rohe, 2010)
This might be alarming, but if you are in a high-risk group for maybe heart-attacks, it can be really important to use those system.
They way the system works remembers me to the andruino-sensors, which are of course not as precise, but to get a general understanding how such things can be done it might be really useful.
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