The present invention relates to a graphical display method and apparatus representing an electrogram signal received from at least one lead used in conjunction with an implantable medical device. The present invention provides a time-expanded waveform of a portion of a signal relating to a single heartbeat....http://www.google.de/patents/US6161039?utm_source=gb-gplus-sharePatent US6161039 - Trigger enhanced electrogram display for positioning an implantable medical device
