  This work presents ReBeatICG, a real-time, low-complexity beat-to-beat
impedance cardiography (ICG) delineation algorithm that allows hemodynamic
parameters monitoring. The proposed procedure relies only on the ICG signal
compared to most algorithms found in the literature that rely on synchronous
electrocardiogram signal (ECG) recordings. ReBeatICG was designed with
implementation on an ultra-low-power microcontroller (MCU) in mind. The
detection accuracy of the developed algorithm is tested against points manually
labeled by cardiologists. It achieves a detection Gmean accuracy of 94.9%,
98.6%, 90.3%, and 84.3% for the B, C, X, and O points, respectively.
Furthermore, several hemodynamic parameters were calculated based on annotated
characteristic points and compared with values generated from the
cardiologists' annotations. ReBeatICG achieved mean error rates of 0.11ms,
9.72ms, 8.32ms, and 3.97% for HR, LVET, IVRT, and relative C-point amplitude,
respectively.
