Method and apparatus for monitoring a plurality of physiological factors contributing to physiological conditions of a heart, that determines a first impedance, corresponding to the plurality of physiological factors, across a plurality of vectors, and a second impedance, corresponding to the plurality...http://www.google.ca/patents/US20040215097?utm_source=gb-gplus-sharePatent US20040215097 - Method and apparatus for impedance signal localizations from implanted devices
