3.1 Study groups
In a study group of 53 patients with an ICD or CRT-D, episodes with an
unknown medication history (n = 77 in 7 patients), episodes with a cycle
length < 240 ms (n = 8 in 7 patients), and episodes in which
the starting point of ventricular tachyarrhythmia could not be confirmed
on intracardiac electrocardiogram (n = 58 in 7 patients) were excluded;
consequently, the remaining 465 episodes in 43 patients were included in
the present analyses (Figure 3, Tables 1 and 2).