Figure 1.

Overview of the circulation detector consisting of three different stages. First, the signal processing stage where the ECG signal and the TI signal are digitally processed to detect the instants of the QRS complexes, and to extract the ICC signal. Second, the feature extraction stage where features characterizing the waveform of the ECG, ICC, and its first derivative are extracted. Finally, the classifier distinguishes between PEA and PR based on the extracted features.