Definition of the reentry circuit with demonstration of a low frequency diastolic potential in a patient with verapamil-sensitive idiopathic left ventricular tachycardia.
A low frequency slow potential preceding the Purkinje spike was recorded at the midseptum during tachycardia in a 69-year-old man with verapamil-sensitive left ventricular tachycardia. This potential was characteristically absent during sinus rhythm before radiofrequency ablation, but became evident following the QRS complex after successful ablation at the tachycardia exit site. Induction of tachycardia with programmed stimulation was dependent on emergence of this slow potential. Decremental conduction was noted between the QRS complex and the slow potential. Further energy application at a site proximal to where the slow potential was initially recorded totally eliminated the slow potential.
Wen
Ming-Shien
MS
Second Section of Cardiology, Department of Medicine, Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan.
Yeh
San-Jou
SJ
Wu
Delon
D
D000200:Action Potentials / Q000187:drug effects*; D000368:Aged; D000889:Anti-Arrhythmia Agents / Q000009:adverse effects*; D003971:Diastole / Q000187:drug effects; D004342:Drug Hypersensitivity / Q000209:etiology*; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D006346:Heart Septum / Q000473:pathology; D006352:Heart Ventricles / Q000473:pathology; D006801:Humans; D008297:Male; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000139:chemically induced* / Q000473:pathology*; D017180:Tachycardia, Ventricular / Q000139:chemically induced* / Q000473:pathology*; D014700:Verapamil / Q000009:adverse effects*
D000889:Anti-Arrhythmia Agents; D014700:Verapamil