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Figure 1 The loop catheter system. (A) 8F with twenty-four 4-mm-long ring electrodes spaced 4 mm apart. (B) 8F with fourteen 12-mm-long coil electrodes spaced 2-mm apart. A soft, braided pull wire attached to the distal tip of the catheter can be retracted into the long guiding sheath to deflect the catheter tip to create a loop of various sizes.