A system and method for passively testing a cardiac pacemaker in which sensing signal amplitudes and lead impedance values are measured and stored while the pacemaker is functioning in its programmed mode. The amplitude and impedance data may be gotten and stored periodically at regular intervals to...http://www.google.de/patents/US6845269?utm_source=gb-gplus-sharePatent US6845269 - Pacemaker passive measurement testing system and method
