Simulation system of arrhythmia and HRV analyzer

We aim to integrate our interactive simulation systems of arrhythmia and heart rate variability (HRV) analyzer by a Windows message to understand the theoretical mechanisms of arrhythmia and HRV. The arrhythmia simulator (250 kB, Visual Basic 6.0) was composed of 4 normal and 2 ectopic foci. The electrical activity of each cell was modeled by the conduction speed and the phase response curve. The ECG waves were graphically plotted with impulse conduction on a ladder diagram. An RR interval was sequentially messaged to the HRV analyzer (90 kB, Visual Basic 6.0), which automatically calculated power spectrum (PS) of HRV by Lomb's method and FFT. The power of VLF, LF and HF bands, mean, SD and range were listed. The HRV analyzer interactively showed the variation of PS influenced by a baseline trend of RR intervals, ectopic beats, sampling rate, the number of samples and window function