System for detecting changes in body posture
First Claim
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1. A system for detecting changes in body posture comprising:
- means for recording electrocardiograms from a subject, said electrocardiograms exhibiting a changing morphology; and
analyzer means, supplied with said electrocardiograms, for determining changes in body posture of said subject from changes in the morphology of said electrocardiograms.
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Abstract
In a system for detecting changes in body posture, electrocardiograms are recorded. The recorded electrocardiograms analyzed are to determine changes in the body posture of a patient from changes in the morphology of the recorded electrocardiograms. The electrocardiogram analysis can be augmented by obtaining and analyzing an accelerometer signal as well.
164 Citations
13 Claims
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1. A system for detecting changes in body posture comprising:
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means for recording electrocardiograms from a subject, said electrocardiograms exhibiting a changing morphology; and analyzer means, supplied with said electrocardiograms, for determining changes in body posture of said subject from changes in the morphology of said electrocardiograms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for detecting body posture changes comprising:
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means for recording electrocardiograms from a subject during a predetermined, first number of cardiac cycles and during a subsequent predetermined, second number of cardiac cycles, each electrocardiogram exhibiting a morphology; averaging means for determining a first average value of a predetermined portion of electrocardiograms recorded during said first number of cardiac cycles, and for determining a second average value of said predetermined portion of electrocardiograms recorded during said second number of cardiac cycles; means for forming a difference between said first average value and said second average value; an accelerometer for obtaining an accelerometer signal from said subject; means for processing said accelerometer signal to obtain a processed signal; first comparator means for comparing said difference to at least one morphology threshold value to obtain a first comparison result indicating a posture change of said subject; second comparator means for comparing said processed signal to at least one accelerometer threshold value to obtain a second comparison result indicating a posture change of said subject; and means for combining said first and second comparison results for generating a signal indicating a posture change of said subject dependent on said first and second comparison results. - View Dependent Claims (11, 12, 13)
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Specification