Abstract |
We recorded a discrete 0.95 mV potential consistent with accessory atrioventricular pathway (AP) activation during serial electrophysiologic studies in a patient with Ebstein's anomaly and Wolff-Parkinson-White syndrome. Bipolar pacing from the catheter electrode in which the AP potential was recorded resulted in a stimulus-ventricle interval identical to the AP-ventricle interval during antegrade conduction, and a stimulus-atrium interval identical to the AP-atrium interval during retrograde conduction. With the patient in the drug-free state, antegrade AP block during atrial pacing and retrograde AP block during ventricular pacing occurred distal to the AP potential (AP-ventricle junction and AP-atrium junction, respectively), supporting the "impedance mismatch" hypothesis. Procainamide and disopyramide each lengthened the antegrade AP effective refractory period by affecting the AP-ventricle junction (possibly by decreasing the current generated by the AP). Both drugs also lengthened the retrograde AP effective refractory period but produced a greater effect on the ventricle-AP junction than on the AP-atrium junction, suggesting marginal geometry of the former. R wave synchronous shocks of 160 and 320 W-sec delivered between the catheter electrode recording the largest unipolar AP potential and a skin electrode produced transient, complete, antegrade block over the AP, suggesting the feasibility of this new nonsurgical technique for AP ablation.
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Authors | W M Jackman, K J Friday, B J Scherlag, M M Dehning, E Schechter, D W Reynolds, E G Olson, E J Berbari, L A Harrison, R Lazzara |
Journal | Circulation
(Circulation)
Vol. 68
Issue 5
Pg. 906-16
(Nov 1983)
ISSN: 0009-7322 [Print] United States |
PMID | 6604589
(Publication Type: Case Reports, Journal Article)
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Chemical References |
- Anti-Arrhythmia Agents
- Propranolol
- Disopyramide
- Procainamide
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Topics |
- Adult
- Anti-Arrhythmia Agents
(therapeutic use)
- Atrioventricular Node
(physiopathology)
- Cardiac Pacing, Artificial
- Disopyramide
(therapeutic use)
- Ebstein Anomaly
(physiopathology)
- Electric Stimulation Therapy
- Electrocardiography
- Electrophysiology
- Endocardium
- Female
- Heart Block
(physiopathology, therapy)
- Heart Conduction System
(physiopathology)
- Humans
- Procainamide
(therapeutic use)
- Propranolol
(therapeutic use)
- Wolff-Parkinson-White Syndrome
(physiopathology)
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