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Method and system for extracting cardiac parameters from plethysmographic signals

  • US 8,790,272 B2
  • Filed: 05/24/2007
  • Issued: 07/29/2014
  • Est. Priority Date: 03/26/2002
  • Status: Active Grant
First Claim
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1. A method for determining cardiac parameters of a subject, comprising:

  • receiving a signal from a thoracocardiograph (TCG) sensor, the signal being sensitive to positions and/or motions of an anterior chest wall of the subject, and the signal comprising a cardiac component, a respiratory component, and noise and/or artifact components;

    receiving one or more electrocardiogram (ECG) signals;

    filtering the received TCG signal such that one or more of the respiratory component and the noise and/or artifact components in the received TCG signal are reduced, the filtering comprising one or more of wavelet de-noising, non-linear filtering, and state space filtering;

    ensemble averaging the filtered TCG signal such that a respiratory component remaining in the filtered TCG signal is reduced, ensemble members being triggered by occurrence of one or more selected fiducial points determined in the ECG signal; and

    extracting parameters of cardiac functioning from the ensemble averaged signal.

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