RR QT
V1 V2 V3 avr V4 avl V5 avf V6
V1 V2 V3 avr avl avf V4 V5 V6
Torsades de pointes
() PVC ( ) late potentials T-wave alternans QT dispersion ()
3 (QTDLPTWA) TWA 56 max Valt : 8.8 µv (in Z lead) max Ralt : 759 (in Z lead)
LP 62 f-qrs: 149 ms (<135) RMS 40 : 12 µv (>20) LAS 40 : 46 ms (<38) QTD 58 QTD = 102 ms (<5070) 50 mm/s
Kaplan Meier (Event-Free Curve) 100 TWA LP Event-Free (%) 80 60 40 20 P=0.006 : TWA positive : TWA negative P=0.0008 : LP positive : LP negative 0 0 2 4 6 8 10 12 Follow-up (Months) 0 2 4 6 8 10 12 Follow-up (Months) Kaplan Meier (Event-Free Curve) 100 QTD EF Event-Free (%) 80 60 40 20 P=0.03 : QTD > 65 ms : QTD < 65 ms P=0.003 : EF < 40% : EF > 40% 0 0 2 4 6 8 10 12 Follow-up (Months) 0 2 4 6 8 10 12 Follow-up (Months)
TWA 93% 59% 28% 98% 64% LP 53% 85% 38% 91% 80% QTD 40% 84% 30% 92% 77% EF 60% 78% 32% 89% 75% Kaplan Meier(Event-Free Curve) TWALP 50% 100 Event-Free (%) 80 60 40 20 0 P<0.0001 : TWALP : TWALP : TWALP : TWALP 0 2 4 6 8 10 12 Follow-up (Months)
V1 V2 V3 avr V4 avl V5 avf V6
(DCM, HCM) QT (ARVC) Brugada WPW 1:1
QTD,LP,TWA
Torsades de pointes
c Baseline Post Pilsicainide mg/kg i.v.