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System and method of impedance cardiography and heartbeat determination

  • US 5,309,917 A
  • Filed: 02/12/1992
  • Issued: 05/10/1994
  • Est. Priority Date: 09/12/1991
  • Status: Expired due to Term
First Claim
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1. A method of processing a time-derivative, thoracic impedance signal generated from a patient to identify events in the time-derivative impedance signal associated with beats of the patient'"'"'s heart, the method comprising the steps of:

  • generating a time-frequency distribution of data from the time-derivative impedance signal for a selected portion of the time-derivative impedance signal spanning a single heartbeat of the patient; and

    identifying a time of occurrence of at least one cardiac event in the selected portion of said time-derivative impedance signal from the time-frequency distribution.

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