METHOD OF DETERMINING CHARACTERISTIC OF SIGNAL INDICATING FUNCTION OF HEART

PROBLEM TO BE SOLVED: To qualitatively and quantitatively evaluate the waveform expression of the function of heart by measuring noize resulting from a physiological or non- physiological reason through measurement of at least one signal indicating the function of heart, and determining the characteristic of at least one signal indicating the function of heart according to the result of measurement. SOLUTION: A QRS group in each flow is detected by QRS detection means 606 from an output of a detection filter 602 to which input EKG (electrocardiogram) data 600 is input, wherein Q is a small but sharp heartbeat wave, R is a normal one, and S is a large and sharp one. Then, from an output of a waveform analysis filter 604 as well as the detection result of QRS group, a continuous waveform starting point to be compared is computed by a means 608, and according to the computed result, the QRS group is stored in a storing means 614. Thereafter, according to output signals of the filter 604 and the means 608, mismatching between the continuous QRS group appearing in one or more leads selected from the input EKG data 600 is computed by a means 616, and the accumulated record of mismatching is maintained. Successively, by use of hystogram/accumulated hystogram data the grade of signal is determined.