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. Author manuscript; available in PMC: 2011 Nov 7.
Published in final edited form as: IEEE Trans Biomed Eng. 2011 Jul 7;58(10):2952–2955. doi: 10.1109/TBME.2011.2161305

Fig. 2.

Fig. 2

Illustration of the algorithm for locating the origin of focal atrial excitation from the 12-lead ECG [1]. The algorithm starts by considering the morphology of the P-wave in lead V1 (positive, negative or isopotential), and then switching between other possible leads down the decision tree. After each switching to the next lead, P-wave morphology in this lead is considered and a new decision is made, such that the tree is continued until a focal location is defined. The block in red (which replaces a single location CT in the original figure) shows the proposed improvement to the algorithm in order to locate focal origins (superior or inferior) within the CT bundle.