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Activation maps (top) and transmembrane voltages (bottom) during bath vagal stimulation. A. LPS caudal shift for 80 nM [ACh]. B: double breakout for 40 nM [ACh]. Voltage traces were obtained at locations labeled in A. Activation maps were computed over yellow windows. Arrows in time traces indicate the sequence of propagation within the SAN. 20-ms isochrones are drawn on activation maps.
