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Detection of apneae and hypopneae in an active implantable medical device

  • US 7,848,792 B2
  • Filed: 07/05/2006
  • Issued: 12/07/2010
  • Est. Priority Date: 07/05/2005
  • Status: Active Grant
First Claim
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1. An active implantable medical device for detection of the occurrence of apneae and hypopneae, comprising:

  • means for collecting endocardial acceleration (EA) signals from a patient implanted with the device using an endocardial lead implanted in the patient'"'"'s heart over at least two heart cycles;

    means for determining from the endocardial acceleration signals the two endocardial acceleration peak values comprising a first peak value (PEA I) corresponding to the peak-to-peak value of the endocardial acceleration signals during an isovolumetric ventricular contraction phrase and a second peak value (PEA II) corresponding to the peak-to-peak value of the endocardial acceleration signal during the isovolumetric ventricular relaxation phase;

    means for calculating a long-term average of at least one of the two endocardial acceleration peak values during a first number of cycles of the at least two heart cycles and a short-term average of the at least one of the two endocardial acceleration peak values during a second number of cycles of the at least two heart cycles;

    means for determining a value as a function of the long-term average and the short-term average of the at least one of the two endocardial acceleration peak values; and

    means for conditionally delivering an output signal representative of an apnea or a hypopnea alert state of the patient based on the value.

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