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Figure 2 The mean DFT ± 1 SD for each number of VF activation cycles in protocol 1. The DFT rises sharply for shocks given after one to four VF cycles, and then more gradually for shocks given after up to 25 VF activations. An asterisk (*) signifies the DFT is significantly less at that number of VF cycles than for the control (C) DFT after 10 s of VF. The filled circles (•) represent the test DFTs. The control DFT is indicated by the open circle ( ).
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