Fig. 9From: A novel method for the detection of R-peaks in ECG based on K-Nearest Neighbors and Particle Swarm OptimizationResult after performing each stage of the method for the ECG with ventricular arrhythmia patterns(ECG recording 233). a) Original signal. b) Filtering. c) Differentiation. d) Absolute value. e) Backward cumulation. f) Detected peaksBack to article page