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. 2004 Oct 22;3:37. doi: 10.1186/1475-925X-3-37

Figure 2.

Figure 2

Extraction of local atrial period (LAP) series from intra-atrial signal. (a) Example of a recorded electrogram during sinus rhythm before pre-processing; (b)-(c) the related LAP series, obtained as the sequence of temporal distances between two consecutive local atrial activations, after detecting time-instants of local atrial depolarization using a derivative / threshold algorithm. a.u. = arbitrary unit