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Automatic determination and selection of filtering in a cardiac rhythm management device

  • US 10,149,627 B2
  • Filed: 11/29/2016
  • Issued: 12/11/2018
  • Est. Priority Date: 12/02/2015
  • Status: Active Grant
First Claim
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1. A cardiac rhythm management device comprising plural sensing electrodes for capturing a cardiac signal and operational circuitry coupled to the plural sensing electrodes for analyzing the cardiac signal, the operational circuitry configured with a selectable filtering mode allowing filtering of the captured cardiac signal according to a first approach and a second approach, the second approach applying an additional high pass filter relative to the first approach, wherein the operational circuitry is configured to operate using the selectable filtering mode as follows:

  • determining whether to select the first approach or the second approach by measuring a first amplitude of the captured cardiac signal, post filtering via the first approach, and comparing the first amplitude to a first threshold and;

    if the first amplitude exceeds the first threshold, enabling the second approach for use in cardiac signal analysis;

    orif the first amplitude does not exceed the first threshold, disabling the second approach for use in cardiac signal analysis; and

    detecting cardiac cycles by comparing a received cardiac signal, as filtered by one of the first or second approaches, to a detection threshold and declaring a new cardiac cycle when the received cardiac signal exceeds the detection threshold,wherein the first amplitude is a measure of the R-wave of one or more cardiac cycles.

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