Table 3. Arrhythmia score.

score	outcome
0	noninducible
1	nonsustained ventricular tachycardia (6-14 beats) induced with triple extra stimuli
2	sustained ventricular tachycardia (>15 beats) with triple extra stimuli
3	nonsustained ventricular tachycardia with double extra stimuli
4	sustained ventricular tachycardia with double extra stimuli
5	nonsustained ventricular tachycardia with single extra stimulus
6	sustained ventricular tachycardia with single extra stimulus
7	ventricular tachycardia induced during the basic drive
8	fatal ventricular tachycardia during the basic drive