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This paper proposes a method for the detection of QRS complexes. The method applies the algorithm proposed by Kupeev [K.Y. Kupeev, On significant maxima detection: a fine-to-coarse algorithm, in: Proceedings of the 13th International Conference on Pattern Recognition, IEEE, vol. 2, August 1996, pp. 270–274] to a shifting window over the ECG signal. The method was tested on the MIT-BIH Arrhythmia database...