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. 2014 Dec 26;20(6):534–541. doi: 10.1111/anec.12253

Figure 1.

Figure 1

Block diagram of the method for estimating AV node parameters. The ECG signal is processed to produce (i) the RR series and (ii) the AFR (determined by spectral analysis of the atrial signal extracted by QRST cancellation). The RR series and the AFR form together the basis for estimation of the AV node parameters. AFR = atrial fibrillatory rate; aRPs = absolute refractory period of the slow pathway; aRPf = absolute refractory period of the fast pathway; rRPs = relative refractory period of the slow pathway; rRPf = relative refractory period of the fast pathway.