Mid-diastolic potential is related to the reentrant circuit in a patient with verapamil-sensitive idiopathic left ventricular tachycardia.
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.
Aiba
T
T
Division of Cardiology, National Cardiovascular Center, Suita, Osaka, Japan.
Suyama
K
K
Matsuo
K
K
Taguchi
A
A
Shimizu
W
W
Kurita
T
T
Aihara
N
N
Kamakura
S
S
D000328:Adult; D000889:Anti-Arrhythmia Agents / Q000627:therapeutic use*; D017115:Catheter Ablation; D003971:Diastole; D004562:Electrocardiography; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D011690:Purkinje Fibers / Q000187:drug effects / Q000503:physiopathology / Q000601:surgery; D012008:Recurrence; D017180:Tachycardia, Ventricular / Q000188:drug therapy / Q000503:physiopathology* / Q000601:surgery; D014700:Verapamil / Q000627:therapeutic use*
D000889:Anti-Arrhythmia Agents; D014700:Verapamil