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Optical mapping of tachycardia-like excitation evoked by pacing in the isolated rat atrium.

Multiple-site optical recording of membrane potential activity using a voltage-sensitive dye was employed to monitor action potentials in the rat atrium. Electrical pacing at 1 Hz evoked the events of tachycardia-like excitation (TE). Optical mapping revealed that a coupling of spontaneous and evoked action potentials resulted in the initiation of TE.