Monitoring the sympathico-vagal activity by analysis of endocardiac acceleration in an active implantable medical device
First Claim
1. An active implantable medical device, including:
- means for collecting an endocardiac acceleration parameter of a patient;
means for analyzing said collected endocardiac acceleration signal including means for determining a first peak endocardiac acceleration (PEA I) corresponding to a phase of isovolumic ventricular contraction in a given cardiac cycle and a second peak endocardiac acceleration (PEA II) corresponding to a phase of isovolumic ventricular relaxation in said given cardiac cycle, and means for determining a heart rate of a patient;
means for calculating a long-term average and a short-term average of the values of the first peaks of endocardiac acceleration (PEA I) collected at the time of the phase of isovolumic ventricular contraction during a plurality of successive cycles;
means for calculating a long-term average and a short-term average of the values of the second peaks of endocardiac acceleration (PEA II) collected at the time of the phase of isovolumic ventricular contraction collected during a plurality of successive cycles;
means for calculating a long-term average and a short-term average of the values of heart rate;
means for delivering at an output a data representative of sympathico-vagal activity of the patient, wherein said data representative of sympathico-vagal activity comprises said calculated long-term and short-term averages of said first peak, second peak, and heart rate; and
means for detecting a risk of syncope when the short-term average of the values of the second peaks of endocardiac acceleration (PEA II) is less than the long-term average of the values of the second peaks of endocardiac acceleration (PEA II) and the short-term average of the values of heart rate is greater than the long-term average of the values of heart rate.
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Abstract
An active implantable medical device having a function for monitoring the sympathico-vagal activity by an analysis of endocardiac acceleration. The device collects at least one physiological parameter of the patient, analyzes that collected parameter and delivers at an output data representative of the sympathico-vagal activity of the patient. The physiological parameter is an endocardiac acceleration (EA), and the representative data include at least one value function of the endocardiac acceleration, in particular a function of a first peak (PEA I) at the time of the phase of isovolumic ventricular contraction and/or of a second peak (PEA II) at the time of the phase of isovolumic ventricular relieving.
15 Citations
11 Claims
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1. An active implantable medical device, including:
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means for collecting an endocardiac acceleration parameter of a patient; means for analyzing said collected endocardiac acceleration signal including means for determining a first peak endocardiac acceleration (PEA I) corresponding to a phase of isovolumic ventricular contraction in a given cardiac cycle and a second peak endocardiac acceleration (PEA II) corresponding to a phase of isovolumic ventricular relaxation in said given cardiac cycle, and means for determining a heart rate of a patient; means for calculating a long-term average and a short-term average of the values of the first peaks of endocardiac acceleration (PEA I) collected at the time of the phase of isovolumic ventricular contraction during a plurality of successive cycles; means for calculating a long-term average and a short-term average of the values of the second peaks of endocardiac acceleration (PEA II) collected at the time of the phase of isovolumic ventricular contraction collected during a plurality of successive cycles; means for calculating a long-term average and a short-term average of the values of heart rate; means for delivering at an output a data representative of sympathico-vagal activity of the patient, wherein said data representative of sympathico-vagal activity comprises said calculated long-term and short-term averages of said first peak, second peak, and heart rate; and means for detecting a risk of syncope when the short-term average of the values of the second peaks of endocardiac acceleration (PEA II) is less than the long-term average of the values of the second peaks of endocardiac acceleration (PEA II) and the short-term average of the values of heart rate is greater than the long-term average of the values of heart rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An active implantable medical device comprising a computer readable medium encoded with one or more computer programs performing the steps of:
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collecting an endocardiac acceleration parameter of a patient; analyzing said collected endocardiac acceleration signal including determining a first peak endocardiac acceleration (PEA I) corresponding to a phase of isovolumic ventricular contraction in a given cardiac cycle and a second peak endocardiac acceleration (PEA II) corresponding to a phase of isovolumic ventricular relaxation in said given cardiac cycle, and determining a heart rate of a patient; calculating a long-term average and a short-term average of the values of the first peaks of endocardiac acceleration (PEA I) collected at the time of the phase of isovolumic ventricular contraction during a plurality of successive cycles; calculating a long-term average and a short-term average of the values of the second peaks of endocardiac acceleration (PEA II) collected at the time of the phase of isovolumic ventricular contraction collected during a plurality of successive cycles; calculating a long-term average and a short-term average of the values of heart rate; delivering at an output a data representative of sympathico-vagal activity of the patient, wherein said data representative of sympathico-vagal activity comprises said calculated long-term and short-term averages of said first peak, second peak, and heart rate; and detecting a risk of syncope when the short-term average of the values of the second peaks of endocardiac acceleration (PEA II) is less than the long-term average of the values of the second peaks of endocardiac acceleration (PEA II) and the short-term average of the values of heart rate is greater than the long-term average of the values of heart rate.
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Specification