Patent ID: 8346357

Claim:
A method of identifying treatable cardiac conditions in an implantable cardiac stimulus device (ICSD), the ICSD comprising a plurality of electrodes for implantation in a patient and operational circuitry electrically coupled to the electrodes and configured to perform analysis of cardiac signals to identify malignant conditions, the method comprising: the ICSD monitoring a signal captured between the electrodes; the ICSD detecting an event in the monitored signal; the ICSD capturing a set of data associated with the detected event; the ICSD dividing the captured set of data into a number of data subgroups; the ICSD assessing the shape of the signal in each of the data subgroups; the ICSD characterizing the signal in each of the data subgroups as either suggesting noise or not suggesting noise; the ICSD determining, for the captured set of data, how many of the data subgroups suggest noise to generate a factor, N; the ICSD comparing N to a threshold for noise indications associated with a detected event; if N exceeds the threshold for noise, the ICSD treating the detected event as caused by noise; or else the ICSD treating the detected event as a cardiac event.