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Figure 3 The mean DFT ± 1 SD for each number of VF activation cycles in protocol 2. Filled circles (•) indicate DFTs for VF initiated from the RV. Filled squares () indicate DFTs for VF initiated from the LV. The open circle () indicates the control DFT determined for shocks given after 10 s of VF. An asterisk (*) signifies that the DFT is significantly less at that number of VF cycles than for the control DFT after 10 s of VF. The right-sided DFTs were significantly less than the left-sided DFTs.