Abnormal waveform extraction method for portable electrocardiogram measurement device

Abstract

To extract a characteristic abnormal waveform from an electrocardiogram waveform measured by a portable electrocardiogram measurement device and convert it to data on the basis of which determination and diagnosis of irregular pulses including paroxysmal atrial fibrillation and the like are performed.SOLUTION: An abnormal waveform is extracted in the electrocardiogram measurement by a portable electrocardiogram measurement device including a sensor part 110 that comes in contact with a human body, a control part 120 for executing processing upon receipt of a detection signal of the sensor part, and a display part 130 for displaying information on an electrocardiogram. An abnormal waveform extraction method for a portable electrocardiogram measurement device includes: a normalizing signal generation step for detecting a plurality of R signals of electrode signals measured in the sensor part and generating a normalizing signal in which the cycles of the R signals are realigned uniformly; an abnormal waveform extraction step for extracting R signals out of a preset reference range of the R signals generated in the normalizing generation step; and an abnormal waveform visualization step for visualizing and providing signals of the extracted abnormal waveform by an electrocardiogram graph.SELECTED DRAWING: Figure 4

Claims

1. A method for extracting abnormal waveforms in electrocardiogram measurement of a portable electrocardiogram measuring device including a sensor unit that contacts the human body, a control unit that receives and processes the detection signal of the sensor unit, and a display unit that displays electrocardiogram information, comprising: An electrocardiogram signal acquisition step of obtaining an electrode signal measured by the sensor unit; A normalizing signal generation step of detecting a plurality of R signals among the obtained electrode signals and generating a normalized signal in which the periods of the R signals are rearranged in a constant manner; An abnormal waveform extraction step of extracting R signals outside a preset reference range among the R signals generated in the normalizing generation step; An abnormal waveform visualization step of visualizing and providing the signal of the extracted abnormal waveform in an electrocardiogram graph, characterized by comprising the above steps. A method for extracting abnormal waveforms of a portable electrocardiogram measuring device.

2. The normalizing signal in the normalizing signal generation step is A signal obtained by rearranging the electrode signal based on the average value of the R intervals among the electrode signals including a plurality of R intervals from the measurement start point, and the method for extracting abnormal waveforms of the portable electrocardiogram measuring device according to Claim 1.

3. The normalizing signal generation step is When the integrated value of the electrode signal including any one R interval among the electrode signals including the plurality of R intervals is discriminated from the average value of the R intervals of another electrode signal, the electrode signal including the discriminated R interval is normalized to match the average value of the R intervals. The method for extracting abnormal waveforms of the portable electrocardiogram measuring device according to Claim 2, characterized in that it is performed as described above.

4. The abnormal waveform extraction step is Extracting the peak value max w(n) of the maximum R signal from the data array x(n) of the signal generated in the normalizing signal generation step; Apply a preset maximum threshold value and minimum threshold value to the peak value of the extracted maximum R signal, and obtain the maximum R peak value of the abnormal signal to which the corresponding maximum threshold value and minimum threshold value are applied. The method for extracting an abnormal waveform of a portable electrocardiogram measuring device according to any one of claims 1 to 3, characterized in that it is performed by obtaining an average waveform based on the maximum R signal value of the obtained abnormal signal.

5. The maximum R peak value of the abnormal signal is the first constant value × max w(n) and the second constant value × max w(n). The method for extracting an abnormal waveform of a portable electrocardiogram measuring device according to claim 4, characterized in that the first constant value is 0.7 and the second constant value is 0.

2.

6. The abnormal waveform visualization step is as follows. The method for extracting an abnormal waveform of a portable electrocardiogram measuring device according to claim 5, characterized in that it is performed by finding R, Q, S, P, and T points in the average waveform obtained in the abnormal waveform extraction step and visualizing and showing them in an electrocardiogram graph based on this.

7. The method for extracting an abnormal waveform of a portable electrocardiogram measuring device according to any one of claims 1 to 3 further includes an integrated index providing step of calculating and analyzing an integrated index including characteristics of an electrocardiogram signal based on the result data extracted in the abnormal waveform extraction step. In the integrated index providing step, indicators of accuracy, sensitivity, specificity, and positive predictive value are calculated using the extracted result data, a weight value is assigned to each calculated indicator, and the integrated index is calculated by selectively combining the indicators. The integrated index is calculated by decreasing the weight value of the corresponding indicator and increasing the weight values of the remaining indicators when the waveform width of some of the indicators is higher than the waveform width of another indicator or a preset set range among the indicators.

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