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Figure 5 (A) Transient accelerated junctional rhythm. Episodes were of short duration (lasting seconds), self-limited, and seen in 1 animal from each group. (B) Transient atrial tachycardia. This rhythm was observed in a control-group mouse (cycle length 36 ms), likely induced by atrial pacing within the vulnerable period of the preceding native P-wave (labeled *). Note accelerated and variable ventricular rate during tachycardia. This finding was not reproduced and was seen only in this mouse. Bipoles and timescale are labeled as in Figure 2.
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