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System and method for detecting heart failure and pulmonary edema based on ventricular end-diastolic pressure using an implantable medical device

  • US 7,437,192 B2
  • Filed: 04/05/2005
  • Issued: 10/14/2008
  • Est. Priority Date: 04/05/2005
  • Status: Expired due to Fees
First Claim
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1. A method for detecting ventricular end diastolic pressure (EDP) within a patient having an implantable medical device equipped with at least one electrical cardiac sensing lead and a pressure sensor, the method comprising:

  • detecting a peak amplitude within an electrical cardiac signal sensed during a heartbeat using the lead;

    detecting a value representative of ventricular EDP for the heartbeat using the pressure sensor by triggering the measurement of left ventricular pressure in response to the detection of the peak amplitude within the electrical cardiac signal;

    tracking respiration cycles;

    tracking heart beats;

    averaging ventricular EDP over heart beats during one respiration cycle;

    identifying changes in averaged ventricular EDP due to respiration; and

    detecting changes, if any, in averaged ventricular EDP not due to respiration.

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