Patent ID: 8874209

Claim:
A medical device for characterizing cardiac status of a patient equipped with an active implant having a biventricular cardiac resynchronization therapy, comprising: means for bi-ventricular pacing at selected ones of a plurality of sites; means for collecting an endocardiac acceleration signal (EA); means for testing a plurality of different pacing configurations by changing at least one of the selected sites, a pacing pulse sequence applied to the selected sites, and a time interval between the application of the pacing pulses to the selected sites, means for searching for an optimal pacing configuration using said testing; means for each tested pacing configuration, delivering a plurality of parameters derived from one of the two endocardiac acceleration peaks (PEA1, PEA2) that appear respectively during the iso-volumetric ventricular contraction and during the iso-volumetric ventricular relaxation; and means for characterizing a patient cardiac status comprising: a) means for analyzing said plurality of parameters and deriving a corresponding plurality of different respective specific indications, and b) means for combining said specific indications in a composite indication of the patient clinical status representative of the patient response to the cardiac resynchronization therapy; c) means for comparing each of said specific indications to predetermined respective criteria, wherein said comparison means further comprises means for comparing first level specific indications derived from a PEA/AVD characteristic and including: i) a first specific indication indicating whether at least one optimal AV Delay has been reached, and ii) a second specific indication representative of the sigmoid factor of said PEA/AVD characteristic; d) a Boolean table that provides a corresponding value of the composite indication in response to said comparison.