A method for use in an implantable medical device system, comprising: selecting a first sensing electrode operatively disposed in a first heart chamber setting a first sensing window corresponding to cardiac electrical events occurring in a second heart chamber enabling a first sense amplifier coupled to the first sensing electrode during the first sensing window sensing a first signal corresponding to cardiac electrical events occurring in the second heart chamber during the first sensing window using the first sensing electrode and transmitting the first signal from an implantable medical device to an external monitor.
