Patent ID: 8239019

Claim:
An implantable electrostimulation device comprising: at least one electrode or one terminal for an electrode; at least three input channels, which are each connected to said at least one electrode or one terminal for an electrode, wherein said at least three input channels are configured to detect at least three different electrical potentials that accompany an excitation of cardiac tissue in a heart, wherein said at least three input channels form at least three sensing channels; memory configured to store data; a signal processing unit connected to said at least three input channels wherein said signal processing unit is configured to analyze a time curve of potentials detected via said at least three sensing channels as three input signals in chronological relation to a periodically repeating trigger signal, which triggers a time window; detect predefined signal features for each of said three input signals within said time window triggered by said periodically repeating trigger signal; determine either a maximum amplitude value for each of said three differential signals or a time offset in said time window of said maximum amplitude value for each of said three differential signals; calculate one summation vector per cardiac cycle for said three input signals within said time window triggered by said periodically repeating trigger signal using either said maximum amplitude value for each of said three differential signals or said time offset in said time window of said maximum amplitude value for each of said three differential signals; store said one summation vector per said cardiac cycle in said memory; and compare said one summation vector to a corresponding summation vector of a preceding time window, determine a change in angle between said summation vector and said summation vector of said preceding time window.