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Figure 5 Graphs of the PPI-TCL difference (abscissa) versus the N + 1 difference (ordinate) are shown for patients with VT (A) and atrial flutter (B). In each panel, the N + 1 difference calculated using a QRS complex or P-wave in the surface ECG is indicated by open circles; the N + 1 differences calculated using an intracardiac Eg are indicated with black squares. ECG = electrocardiogram; PPI = postpacing interval; TCL = tachycardia cycle length; VT = ventricular tachycardia.
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