Diastolic Potentials Observed in Idiopathic Left Ventricular Tachycardia
Japanese Circulation Journal - English Edition
diopathic left ventricular tachycardia (ILVT) with right bundle branch block and left axis deviation is known to be verapamil sensitive, and is considered to originate close to or in the posterior fascicle of the Purkinje fiber network. 1-3 Reentry has been postulated as the mechanism of this ventricular tachycardia (VT) on the basis that it can be induced and terminated by extrastimuli, 3 and this hypothesis is supported by the fact that transient entrainment is seen in this VT. 4 Thus it is
... VT. 4 Thus it is considered that the VT has an excitable gap and slow conduction zone. Radiofrequency catheter ablation (RF-CA) has a high success rate in eliminating this VT. Both a perfect pace map and a Purkinje potential (PP) preceding the ventricular activation are recognized as good guides for RF-CA of this VT. 5-9 However, only a few reports have described the origin of a diastolic potential (DP) in ILVT and RF-CA guided by that DP. We were able to record a DP in some cases with ILVT and the aim of the present study was to determine the significance of the DP recorded during the VT by examining the type of termination of the VT, and evaluating the efficacy of mapping for a DP as a guide for RF-CA.