| 摘要 |
FIELD: medicine. ^ SUBSTANCE: method involves electrocardiosignal filtration and quantisation in time. In the first q cardiocycles, reference points are detected, cardiocycle duration is determined, mean cardiocycle duration and number of discrete counts N corresponding to this mean value are determined and used as basis for threshold value of cardiocycle duration change. In the first q cardiocycles, mean power P0 of counts is determined, three threshold power levels ö1=1.5P0, ö2=0.5P0 and ö3=1P0 are determined, where 1>2 and threshold value of cardiocycle duration change Nthr=kN where 0<k<1. At each quantisation stage, total power of sequence of N counts is determined and compared to threshold levels ö1, ö2 and ö3. If threshold level ö3 corresponding to a single systole is exceeded then gate signal of 2N duration is formed, and number of single extrasystoles is counted. Extrasystole presence signal appears if this number exceeds specified value M per time unit. Arrhythmia signal is formed if threshold value Nthr is reached as a result of counting sequence of total power values exceeding ö1 or not exceeding ö2 in the absence of gate signal. Device includes filter, quantisation unit, clock pulse source, reference point forming unit, unit defining mean cardiocycle duration, cardiocycle counter, computer of threshold levels of cardiocycle duration change, four comparators, squaring unit, mean count power defining unit, total count power defining unit, three threshold level computers, OR circuit, pulse counter, gate duration assignment unit, extrasystole gating unit, extrasystole counter unit, AND circuit. ^ EFFECT: increased reliability of electrocardiosignal arrhythmia identification for a wide range of cardiograms with various modifications of element forms in the presence of interference and extrasystolic complexes. ^ 2 cl, 8 dwg |
