Resetting of Tachycardia Cycle by Single and Double Ventricular Extrastimuli in Recurrent Sustained Ventricular Tachycardia

In two cases with recurrent sustained ventricular tachycardia (VT) due to re‐entry, the response pattern to extrastimuli during the tachycardia was studied. In each case, right ventricular extrastimuli with longer coupling intervals during VT were followed by fully compensatory pauses and with short...

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Bibliographic Details
Published in:Pacing and clinical electrophysiology 1984-01, Vol.7 (1), p.3-9
Main Authors: INOUE, HIROSHI, INOUE, KIYOSHI, MATSUO, HIROSHI, KUWAKI, KEIICHI, SHIRAI, TETSURO, MURAO, SATORU
Format: Article
Language:English
Subjects:
Adult
Bundle of His - physiopathology
compensatory pause
Electric Stimulation
Electrocardiography
Electrophysiology
extrastimulation
Heart Atria - physiopathology
Heart Ventricles - physiopathology
Humans
Male
re-entry
Recurrence
reset
Tachycardia - physiopathology
ventricular tachycardia
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Description
Summary:In two cases with recurrent sustained ventricular tachycardia (VT) due to re‐entry, the response pattern to extrastimuli during the tachycardia was studied. In each case, right ventricular extrastimuli with longer coupling intervals during VT were followed by fully compensatory pauses and with shorter coupling intervals reset the tachycardia cycle. In one case, a plateau was produced by a single extrostimulus, resembling that seen in the response curve of sinus node automaticity as well as ectopic atrial tachycardia. Two successive stimuli produced three definite zones, i.e., fully compensatory, reset producing a plateau, and progressive prolongation zones with shortening of the coupling intervals between the two stimuli, and terminated the tachycardia with further shortening of the coupling intervals. In conclusion, resetting phenomenon was confirmed on two cases with re‐entrant VT. This phenomenon cannot be used as a criterion to determine the mechanism responsible for VT.
ISSN:0147-8389
1540-8159
DOI:10.1111/j.1540-8159.1984.tb04851.x