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Unwanted stimulation detection during cardiac pacing

  • US 9,604,065 B2
  • Filed: 08/26/2014
  • Issued: 03/28/2017
  • Est. Priority Date: 08/30/2013
  • Status: Active Grant
First Claim
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1. A system for cardiac rhythm management comprising:

  • a pulse generator for generating pacing pulses for stimulating a heart of a patient;

    a memory;

    a sensor configured to sense a response to a stimulation of a phrenic nerve of the patient and to produce a corresponding sensor signal;

    a processing circuit in communication with the memory and the sensor, the processing circuit configured to;

    receive the sensor signal for a time after one or more pacing pulses;

    derive a time-frequency representation of the sensor signal based on the received sensor signal using wavelets;

    identify a dominant frequency component in the time-frequency representation of sensor signal;

    determine if the dominant frequency component falls within a predetermined frequency range;

    identify a time of occurrence of the dominant frequency component relative to a corresponding pacing pulse;

    determine if the time of occurrence of the dominant frequency component occurs within a predetermined time window;

    determine if the phrenic nerve of the patient has been stimulated based, at least in part, on the time-frequency representation of the sensor signal such that the dominant frequency component falls within the predetermined frequency range and the dominant frequency component occurs within the predetermined time window;

    store a phrenic nerve stimulation event identifier in the memory if the processing circuit determines that the phrenic nerve of the patient has been stimulated.

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