System and Method for Electrocardiographic Data Signal Gain Determination With the Aid of A Digital Computer
First Claim
1. A method for electrocardiographic data signal gain determination with the aid of a digital computer, comprising the steps of:
- receiving, by a download station from an ambulatory monitor recorder interfaced to the download station, compression codes representing cutaneous action potentials recorded by the monitor recorder;
decompressing by the download station the compression codes into a time series that comprises a digital representation of a raw electrocardiography (“
ECG”
) signal;
identifying by the download station cardiac waveforms within the time series falling within one or more temporal windows and measuring peak-to-peak voltages in the identified cardiac waveforms; and
statistically representing a correlation between the peak-to-peak voltages on the download station and determining based on the statistical representation a signal gain that places the correlation between the peak-to-peak voltages within a range preferred for visualizing the cardiac waveforms.
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Accused Products
Abstract
In one embodiment, ECG data collected during the long-term monitoring are compressed through a two-step compression algorithm executed by an electrocardiography monitor. Minimum amplitude signals may become indistinguishable from noise if overly inclusive encoding is employed in which voltage ranges are set too wide. The resulting ECG signal will appear “choppy” and uneven with an abrupt slope. The encoding used in the first stage of compression can be dynamically rescaled on-the-fly when the granularity of the encoding is too coarse. In a further embodiment, offloaded ECG signals are automatically gained as appropriate on a recording-by-recording basis to preserve the amplitude relationship between the signals. Raw decompressed ECG signals are filtered for noise content and any gaps in the signals are bridged. An appropriate signal gain is determined based on a statistical evaluation of peak-to-peak voltage (or other indicator) to land as many ECG waveforms within a desired range of display.
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Citations
20 Claims
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1. A method for electrocardiographic data signal gain determination with the aid of a digital computer, comprising the steps of:
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receiving, by a download station from an ambulatory monitor recorder interfaced to the download station, compression codes representing cutaneous action potentials recorded by the monitor recorder; decompressing by the download station the compression codes into a time series that comprises a digital representation of a raw electrocardiography (“
ECG”
) signal;identifying by the download station cardiac waveforms within the time series falling within one or more temporal windows and measuring peak-to-peak voltages in the identified cardiac waveforms; and statistically representing a correlation between the peak-to-peak voltages on the download station and determining based on the statistical representation a signal gain that places the correlation between the peak-to-peak voltages within a range preferred for visualizing the cardiac waveforms. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for providing dynamic gain over electrocardiographic data with the aid of a digital computer, comprising:
a download station configured to interface to an ambulatory monitor recorder and configured to execute code comprising; a receipt module configured to receive from the monitor recorder when the recorder is interfaced to the download station compression codes representing cutaneous action potentials recorded by the monitor recorder; a decompression module configured to decompress the compression codes into a time series of a plurality of values that comprises a digital representation of a raw electrocardiography (“
ECG”
) signal;an identification module configured to identify cardiac waveforms within the time series falling within one or more temporal windows and to measure peak-to-peak voltages in the identified cardiac waveforms; and a correlation module configured to statistically representing a correlation between the peak-to-peak voltages on the download station and to determine based on the statistical representation a signal gain that places the correlation between the peak-to-peak voltages within a range preferred for visualizing the cardiac waveforms. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for providing rescalable encoding during an ambulatory monitor recorder monitoring, comprising the steps of:
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sensing a series of electrocardiography values with a monitor recorder; maintaining a plurality of codes, each associated with a range of electrocardiographic values; processing the series of the electrocardiography values in successively-occurring temporal windows, for each temporal window comprising the steps of; calculating a peak-to-peak voltage of the electrocardiography values in the temporal window; comparing the peak-to-peak voltage to a threshold and adjusting the range associated with each of the codes when the peak-to-peak value is less than the threshold; encoding each of the electrocardiography values from the series with the code associated with the range into which the electrocardiography value falls; and writing each of the codes into a sequence in a non-volatile memory of the monitor recorder. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification