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Figure 5 Mean antidromic penetration (AP) plotted against entrainment rate. When compared to other sites within the atrial flutter circuit, there was significant blunting (p = 0.003) in the extent of AP measured from the isthmus exit at entrainment rates of FCL–30 (8 ± 3 mm) and FCL–40 (9 ± 3 mm). FCL = flutter cycle length; HSRA/HLRA/LLRA = high septal, high lateral and low lateral right atrium.
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