A signal evaluation method for detecting QRS complexes in electrocardiogram (ECG) signals comprises the following steps:

    • sampling of the ECG signal (4) and conversion into discrete signal values (x(n)) in chronological order;
    • comparing the signal values (xf(n), xfq(n)) to a threshold function (K(n)) adaptively determined therefrom;
    • determining a frequency number (D(n)) within a defined segment of the consecutive signal values, by which signal values (xf(n), xfq(n)) preferably fall short of the threshold function (K(n));
    • comparing the determined frequency number (D(n)) to a defined threshold (), wherein an undershoot of the threshold () is significant for apresence of a QRS complex (5, 6, 7) in the defined segment of the ECG signal (4).
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