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Spatially discordant action potential duration (APD) and Ca alternans in a rabbit heart. (a) An image of a rabbit heart and the optical mapping area. (b) Simultaneous recordings of voltage and Ca from three different sites marked in (a). (c) Nodal lines (white) in APD alternans map. (d) Nodal lines (white) in the Ca alternans map. Modified from Hayashi et al. [44].
