Figure 6. Computed ECG showing the role of a medium-sized array in producing a torsadelike ECG. Shown here are two computed ECGs, one from a 40x40 array and the other from a 90x90 array. Note that in the smaller array, in which a small spiral fragment is permitted to develop, the ECG displays a large degree of amplitude modulation of the underlying signal derived from the rotating spiral wave. For the larger array, the amplitude of the modulation is considerable reduced, producing a more monomorphic ECG.
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