The present invention permits discrimination between evoked response signals and post-pace polarization signals sensed by an implantable medical device by noting the polarity of the positive or negative change in voltage in respect of time (or dv/dt) of the waveform incident on the lead electrodes during...http://www.google.com/patents/US6477422?utm_source=gb-gplus-sharePatent US6477422 - Method and apparatus for capture detection
