Hardware implementation of a modified delay-coordinate mapping-based QRS complex detection algorithm

We present a modified delay-coordinate mapping-based QRS complex detection algorithm, suitable for hardware implementation. In the original algorithm, the phase-space portrait of an electrocardiogram signal is reconstructed in a two-dimensional plane using the method of delays. Geometrical properties of the obtained phase-space portrait are exploited for QRS complex detection. In our solution, a bandpass filter is used for ECG signal prefiltering and an improved method for detection threshold- level calculation is utilized. We developed the algorithm on the MIT- BIH Arrhythmia Database (sensitivity of 99.82% and positive predictivity of 99.82%) and tested it on the long- term ST database (sensitivity of 99.72% and positive predictivity of 99.37%). Our algorithm outperforms several well- known QRS complex detection algorithms, including the original algorithm.