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Extraction of hemodynamic pulse pressure from fluid and myocardial accelerations

  • US 6,026,324 A
  • Filed: 10/13/1998
  • Issued: 02/15/2000
  • Est. Priority Date: 10/13/1998
  • Status: Expired due to Term
First Claim
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1. A cardiac stimulating apparatus functioning in a preset pacing mode having preset pacing rates and timing intervals, and programmed to optimize cardiac performance of a patient'"'"'s heart, said cardiac stimulating apparatus comprising:

  • a) a pulse generator;

    b) an accelerometer electrically coupled to a controller of the cardiac stimulating apparatus, said accelerometer transmitting a signal associated with fluid and myocardial accelerations of the patient'"'"'s heart;

    c) filtering means coupled to the accelerometer for filtering and conditioning the signal transmitted by the accelerometer to produce a waveform related to a pulse pressure within the patient'"'"'s heart; and

    d) said controller including a timing means for identifying cardiac cycles of the patient'"'"'s heart, a linear prediction means for predicting values associated with the waveform, bandwidth determining means for determining a bandwidth from predicted values of the waveform, center frequency determining means for determining a center frequency from predicted values of the waveform, means for calculating an amount indicative of pulse pressure from the determined bandwidth and center frequency, and analyzing means for analyzing the amounts indicative of pulse pressure over corresponding cardiac cycles.

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