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Usefulness of a new sound spectral averaging technique to distinguish an innocent systolic murmur from that of aortic stenosis

  • Morton E. Tavel
    Correspondence
    Dr Tavel's address is: The Care Group at St.Vincent, 8333 Naab Road, Suite 400, Indianapolis, Indiana 46260.
    Affiliations
    The Indiana Heart Institute, Care Group, Inc., and St Vincent Hospital, Indianapolis, Indiana
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  • Author Footnotes
    ⁎ Dr. Katz is President, Point of Care Diagnostics, Inc., Toronto, Ontario, Canada
    Hart Katz
    Footnotes
    ⁎ Dr. Katz is President, Point of Care Diagnostics, Inc., Toronto, Ontario, Canada
    Affiliations
    Point of Care Diagnostics, Inc., Toronto, Ontario, Canada. This study was partially funded by the St. Vincent Foundation, Indianapolis, Indiana
    Search for articles by this author
  • Author Footnotes
    ⁎ Dr. Katz is President, Point of Care Diagnostics, Inc., Toronto, Ontario, Canada
      We present a new method to record and display heart sounds that uses a hand-held computer and stethoscopic recording device. It allows for rapid spectral and waveform displays of murmurs and provides a means for signal averaging of spectral frequency content. Compared with aortic stenosis, innocent murmurs primarily contain frequencies of <300 Hz and persist for a shorter duration at the upper-frequency levels. This method provides for rapid characterization of innocent murmurs, a means for comparison with other murmurs, and transmission of acoustic data to distant sites.
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