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Figure 3 An example of spontaneous variation in the ventricular tachycardia (VT) cycle length, with changes in the interval between Purkinje potentials preceding the changes in RR interval. Displayed are 2 panels recorded at different times during the same VT. Leads V1 and V6 and intracardiac recordings from the mapping catheter (Map) and the right ventricular apex (RVA) are shown. The Purkinje potential intervals and RR intervals are indicated.
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