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Figure 3 The relation between false post-pacing interval (FPPI) determined from the far-field potential (FFP), and the true post-pacing interval (TPPI) for classifying circuit sites are shown. A circuit site is defined as having a TPPI-ventricular tachycardia cycle length difference of  30 ms (14). At 12% of the sites where a TPPI >30 ms indicated a bystander site, measurement to the FFP yielded a false PPI-tachycardia cycle length difference 30 ms that falsely classified the site as in the reentry circuit. At 44% of sites where the TPPI-tachycardia cycle length difference 30 ms classified the site as in the circuit, the FPPI was >30 ms, classifying the site as remote from the circuit. At 44% of the sites, both FPPI and TPPI classified the site as a bystander.
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