Key result
In a patient with verapamil-sensitive idiopathic ventricular tachycardia, pacing demonstrated that the mid-diastolic potential was on the reentrant circuit while the Purkinje potential was a bystander.
Case Report (n=1)
Electrophysiological findings suggest that the mid-diastolic potential is part of the reentrant circuit in verapamil-sensitive idiopathic left ventricular tachycardia, while the Purkinje potential acts as a bystander.
We report a case of verapamil-sensitive idiopathic ventricular tachycardia in which a mid-diastolic potential (MDP) 45 msec preceding the Purkinje potential (P potential) was recorded. Pacing during the tachycardia caused concealed entrainment, and the stimulus-QRS interval was equal to the P potential-QRS interval. The interval between the last pacing stimulus and the next P potential (postpacing interval) was longer than the ventricular tachycardia cycle length, but the MDP was orthodromically activated. These findings suggest that the MDP was on the reentrant circuit and the P potential was not on the reentrant circuit, but a bystander.
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Aiba et al. (1998) conducted a case report in Verapamil-sensitive idiopathic left ventricular tachycardia (n=1). Pacing during tachycardia was evaluated on Electrophysiological characteristics of mid-diastolic potential and Purkinje potential. In a patient with verapamil-sensitive idiopathic ventricular tachycardia, pacing demonstrated that the mid-diastolic potential was on the reentrant circuit while the Purkinje potential was a bystander.
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