Described is an implantable device configured to monitor for changes in the intensity and/or duration of a systolic murmur such as mitral regurgitation by means of an acoustic sensor. Such changes may be taken to indicate a change in a patient's heart failure status. Upon detection of a worsening in...http://www.google.de/patents/US7404802?utm_source=gb-gplus-sharePatent US7404802 - Trending of systolic murmur intensity for monitoring cardiac disease with implantable device
