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Non-invasive measurement of second heart sound components

  • US 7,909,772 B2
  • Filed: 04/15/2005
  • Issued: 03/22/2011
  • Est. Priority Date: 04/16/2004
  • Status: Active Grant
First Claim
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1. A method for estimating a location of pulmonary and aortic components of second heart sounds of a patient over an interval, the method comprising the steps of:

  • producing an electronic representation of heart sounds of the patient over the interval;

    identifying at least one second heart sound in the interval using said electronic representation;

    for each identified second heart sound;

    calculating a frequency weighted energy (FWE);

    normalizing said FWE;

    identifying peaks in said FWE;

    determining a maximum peak from said identified peaks; and

    retaining said maximum peak and peaks having an amplitude within a predetermined amount of an amplitude of said maximum peak;

    wherein if two or more peaks are retained, two largest peaks are selected, a first peak as a candidate value for the aortic component and a second peak as a candidate value for the pulmonary component, wherein said first peak is prior to said second peak and wherein if only a single peak is retained, said single peak is selected as a candidate value for the aortic component; and

    generating an estimated value for a location of the aortic component and the pulmonary component from said candidate values;

    wherein said FWE calculating step comprises generating a Non Linear Energy Operator (NLEO) function for each identified second heart sound; and

    wherein in said peak identifying step, a maximum peak value is identified and any identified peaks having a value less than a predetermined amount of said maximum peak value are discarded.

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