Signal analysis in implantable cardiac treatment devices

摘要

Methods and devices for cardiac signal analysis in implantable cardiac therapy systems. Several signal processing and/or conditioning methods are shown including R-wave detection embodiments including the use of thresholds related to previous peak amplitudes. Also, some embodiments include sample thresholding to remove extraneous data from sampled signals. Some embodiments include weighting certain samples more heavily than other samples within a sampled cardiac signal for analysis.

主权项

1. A method of cardiac signal analysis in an implantable cardiac system comprising a plurality of implantable electrodes for sensing signals from implanted locations coupled to circuitry for analysis of sensed signals, the method comprising:
capturing a cardiac signal by the use of the plurality of electrodes; detecting a cardiac event; conditioning a portion of the cardiac signal associated with the cardiac event; and analyzing at least some parts of the conditioned portion of the cardiac signal to determine whether the patient is likely experiencing a malignant cardiac condition; wherein the step of conditioning a portion of the cardiac signal associated with the cardiac event includes sampling the cardiac signal to generate a number of samples and comparing a selected sample to a sample threshold and, if the sample magnitude does not exceed the sample threshold, replacing the sample with a different value.