Electrocardiogram signal preprocessing for automatic detection of QRS boundaries

Automatic detection of QRS onset and offset points with reasonable accuracy has been a difficult task, approached since the first attempts at computer ised electrocardiogram interpretation. The problem is additionally complica ted by the usual presence of power-line interference, electromyogram artefa cts and baseline fluctuation in the original signal, especially in multipha se complexes with small q, r, r', or s' waves. We propose a preprocessing m ethod guaranteeing accurate preservation of the QRS boundaries, even in the existence of strong power-line or electromyogram noise. Examples of detect ion of QRS onset and offset points and a comparison with observer markings are presented for the assessment of preprocessing efficiency and detection consistency. (C) 1999 IPEM. Published by Elsevier Science Ltd. All rights r eserved.