Figures
Figure 1. (A) Difference in the cycle length variability of VT.
The left panel shows a constant cycle length, whereas the right panel
shows the variation in the cycle length. (B) Example of multiple VT
episodes within an episode.
Regular VTs account for a larger number of VT types, classified by the
variability within an episode. The RE value is calculated by dividing
the number of regular VTs (6) by the number of total VTs in the episode
(6). A-A = atrial cycle length; RE = reproducibility within an episode;
Reg = regular; Term. = termination; VF = ventricular fibrillation; VT =
ventricular tachycardia; V-V = ventricular cycle length.
Figure 2. A patient with five VT episodes.
Most VTs in all episodes are irregular. The RI value is calculated by
dividing the number of irregular VTs in all episodes of patient (11) by
the number of total VT episodes of patient (15), i.e., 11/15 = 0.73. I =
irregular VT; R = regular VT; RI = reproducibility within an individual;
VT = ventricular tachycardia.
Figure 3. Flow chart of patient selection.
ATP = anti-tachycardia pacing; CL = cycle length; VF = ventricular
fibrillation; VT = ventricular tachycardia.