Methods for enhancement of HRV and late potentials measurements
First Claim
1. A method for generating a heart rate variability measurement for a system for playing back recorded ECG data, the method comprising the steps of:
- playing back the recorded ECG data to generate a plurality of corresponding output ECG signals;
defining a reference point on each output ECG signal;
measuring a period between the reference points on a first output ECG signal and a second adjacent output ECG signal;
adjusting the period by an amount necessary to align the reference points of the first and second output ECG signals;
determining the heart rate variability measurement responsive to the adjusted period; and
displaying the heart rate variability measurement.
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Accused Products
Abstract
An ECG recorder and playback unit which includes software-implemented digital signal processing filters which include a method for generating a heart rate variability (HRV) and late potential measurements. The HRV method includes playing back the ECG data on the playback unit and a defining a reference point, usually corresponding to the R-wave peak, on each output ECG signal. An initial period is determined between the reference points. The period is then adjusted so as to align the reference points of the output ECG signals. The amount by which the ECG signals are adjusted is determined by computing a phase difference at a predetermined reference frequency and dividing the phase difference by the reference frequency to produce a period difference. The period is then adjusted by the period difference by adding the period difference to the measured period. The adjusted period is then used to compute the HRV measurement using statistical techniques. In an alternative embodiment of the HRV measurement, an interpolation technique is used to increase the accuracy of the reference point definition and thereby increase the accuracy of the period determination. A phase-ramp technique is employed to improve the frequency resolution of the ECG signal to improve the detection of late potentials.
52 Citations
15 Claims
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1. A method for generating a heart rate variability measurement for a system for playing back recorded ECG data, the method comprising the steps of:
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playing back the recorded ECG data to generate a plurality of corresponding output ECG signals; defining a reference point on each output ECG signal; measuring a period between the reference points on a first output ECG signal and a second adjacent output ECG signal; adjusting the period by an amount necessary to align the reference points of the first and second output ECG signals; determining the heart rate variability measurement responsive to the adjusted period; and displaying the heart rate variability measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for generating a heart rate variability measurement for a system for playing back recorded ECG data, the method comprising the steps of:
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playing back the recorded ECG data to generate a plurality of corresponding output ECG signals; sampling the output ECG signals at a first rate; interpolating between adjacent output ECG signal samples to obtain interpolated data; using said interpolated data to define a reference point on each output ECG signal; measuring a period between the reference points on adjacent output ECG signals; determining the heart rate variability measurement responsive to the measured periods; and displaying the heart rate variability measurement. - View Dependent Claims (10, 11, 12)
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13. A system for recording and playing back ECG data, said system operating at a sampling rate, said system comprising:
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a portable Holter recorder for recording ECG signals; playback means for playing back the recorded ECG signals; means for aligning the played back ECG signals independent of said sampling rate of said system; and means for generating a heart rate variability measurement from the aligned ECG signals. - View Dependent Claims (14, 15)
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Specification