Detection of apneae and hypopneae in an active implantable medical device
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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Abstract
An active implantable medical device for diagnosis and/or therapy that is able to detect the occurrence of apnea and hypopnea. The detection of an occurrence of respiratory apneae or hypopneae is performed by collecting the patient'"'"'s endocardial acceleration (EA), and determining at least one parameter, i.e., a peak acceleration, (PEA I, PEA II) that is a function of this collected endocardial acceleration. An apnea or hypopnea alert signal is then conditionally delivered as a function of the value taken by this (these) parameter(s).
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Citations
30 Claims
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1. An active implantable medical device for detection of the occurrence of apneae and hypopneae, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An active implantable medical device for detecting apneae and hypopneae, comprising:
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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 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 phase and a second peak value (PEA II) corresponding to the peak-to-peak value of the endocardial acceleration signal during an 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 at least one parameter 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; means for comparing said at least one parameter value to a first threshold; and means for delivering an output signal representative of an alert state corresponding to an apnea or a hypopnea in response to said at least one parameter value crossing said first threshold. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification