Table 2. Series comparing patients with polymorphic versus monomorphic idiopathic RVOT VT: electrocardiographic parameters*.
| Polymorphic VT | Monomorphic VT | p | |
|---|---|---|---|
| QTc in sinus rhythm (msec) | |||
| Noda et al.10) | 403±21 | NA | NA |
| Igarashi et al.18) | 440±31 | 440±27 | NS |
| Number of PVCs (day) | |||
| Noda et al.10) | 17500±11300 | 15500±16000 | NS |
| Igarashi et al.18) | 20000±12000 | 16000±15000 | NS |
| Kurosaki et al.16) | 19000±12000 | 22000±10000 | NS |
| QRS duration of PVC (msec) | |||
| Noda et al.10) | 148±8 | 142±12 | NS |
| Coupling interval (msec) | |||
| Noda et al.10) | 409±62 | 428±65 | NS |
| Igarashi et al.18) | 477±71 | 483±77 | NS |
| Kurosaki et al.16) | 440±73 | 444±63 | NS |
| Positive QRS in lead I† (%) | |||
| Kurosaki et al.16) | 0071 | 0035 | <0.05 |
| Cycle length of VT (msec) | |||
| Noda et al.10) | 245±28 | 328±65 | <0.001 |
| Igarashi et al.18) | 272±59 | 378±85 | <0.001 |
| Kurosaki et al.16) | 224±34 | 330±69 | <0.001 |
| VT inducibility rate (%) | |||
| Kurosaki et al.16) | 0 | 1 | <0.05 |
Values are presented as mean±standard deviation or number (%). *Studies comparing patients with idiopathic polymorphic RVOT VT to patients with monomorphic RVOT VT (16 vs. 85 patients in the study by Noda et al.10) 18 vs. 21 patients in the study by Igarashi et al.18) and 14 vs. 77 in the study by Kurosaki et al).16) †Refers to the QRS morphology of the ventricular extrasystole triggering VT. RVOT: right ventricular outflow tract, VT: ventricular tachycardia, PVC: premature vetricular contraction, NA: not applicable, NS: not statistically significant