WSN for blood pressure and heart rate monitoring using arduino

Hello, I'm new to arduino as I intend to work on the project as stated above. From research I have decided to use an xbee radio series 2 also. Problem is I don't know what blood pressure and pulse rate sensor to get. Please guide me

Sparkfun have this for heart rate. I think I remember reading threads on the forum where folks have had problems with it. Search the forum...

As to BP I don't know: it's a bit more complicated I should think, since there's the inflatable cuff required. Not sure if there's a "hobby-level" one available?