Patent ID: 6745074
Filing Date: 2004-06-01
Classification: A61N

Abstract:
An implantable heart stimulator comprising:a cardiac activity detector, supplied with incoming electrical heart signals each having a peak amplitude value, said incoming electrical heart signals including signals representing a premature ventricular contraction, if said premature ventricular contraction has occurred, said cardiac activity detector having a first sensitivity level and detecting heart signals, among said incoming electrical heart signals, having a peak amplitude value exceeding said first sensitivity level; a heart signal classifier, also supplied with said incoming electrical heart signals, for classifying the respective peak amplitude values of said incoming electrical heart signals as histogram data according to the respective peak amplitude values, said heart signal classifier having a second sensitivity level, which is lower than said first sensitivity level, allowing updating of said histogram data with peak amplitudes of heart signals among said incoming electrical heart signals having a peak amplitude that is below said first sensitivity level; and an analyzer in communication with said classifier and supplied with said histogram data from said classifier, and in communication with said cardiac activity detector for setting said first sensitivity level thereof to include detection of said signals representing a premature ventricular contraction, dependent on an analysis in said analyzer of said histogram data.