Table 3. Prematurity indexes in patients with idiopathic polymorphic right ventricular tachycardia and patients with idiopathic ventricular fibrillation^*.

	Idiopathic polymorphic RVOT VT	Idiopathic ventricular fibrillation
Coupling interval (msec)	477±71	302±52
Prematurity Index	0.6±0.1	0.4±0.1
QT index	1.08±0.14	0.85±0.1

Values are presented as mean±standard deviation. ^*Data on polymorphic RVOT patients by Igarashi et al.¹⁸⁾ is compared to our original data on idiopathic VF patients.⁹⁾ For definitions, see the text. RVOT: right ventricular outflow tract, VT: ventricular tachycardia