One embodiment of the present invention relates to a system for deriving physiologic measurement values that are relative to ambient conditions. In one embodiment, the system comprises an implantable medical device (“IMD”) and an external monitor. The IMD is adapted to determine an absolute physiologic...http://www.google.ca/patents/US20060064134?utm_source=gb-gplus-sharePatent US20060064134 - Systems and methods for deriving relative physiologic measurements
