Key result
EP mapping reveals systolic potentials reflect critical reentrant circuits and diastolic potentials reflect bystander pathways.
Why the study?
The electrophysiological characteristics of systolic and diastolic potentials in the left interventricular septum during sinus rhythm in verapamil-sensitive idiopathic left ventricular tachycardia were not well described.
What are the electrophysiological characteristics of systolic and diastolic potentials in verapamil-sensitive left ventricular tachycardia?
Case Report (n=1)
What are the electrophysiological characteristics of systolic and diastolic potentials in verapamil-sensitive left ventricular tachycardia?
In verapamil-sensitive idiopathic left ventricular tachycardia, systolic potentials appear to reflect a critical component of the reentrant circuit, whereas diastolic potentials reflect a bystander pathway.
Case-level SP/DP observations should not alter ablation practice; leaves open reproducibility across verapamil-sensitive VT.
We studied the electrophysiological characteristics of systolic (SP) and diastolic (DP) potentials recorded during sinus rhythm (SR) in the left interventricular septum of a 27 year-old woman presenting with verapamil-sensitive idiopathic left ventricular tachycardia (VT). During SR, and during VT, SP was activated from ventricular base-to-apex, and DP from apex-to-base. SP and DP were both detected at the site of successful ablation during SR, whereas during VT, DP was detected away from the earliest activation site. Thus, SP apparently reflected a critical component of the reentrant circuit, while DP reflected the activation of a bystander pathway.
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Kaneko et al. (2012) conducted a case report in Verapamil-sensitive idiopathic left ventricular tachycardia (n=1). Electrophysiological mapping and ablation was evaluated on Electrophysiological characteristics of systolic and diastolic potentials. Electrophysiological mapping revealed that systolic potentials reflect a critical component of the reentrant circuit, while diastolic potentials reflect the activation of a bystander pathway.
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