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Double Ventricular Response by a Single Ventricular Extrastimulus to the Inner Loop of Reentry in a Patient Without Apparent Heart Disease
Author(s) -
SHIMIZU AKIHIKO,
YAMAGATA TOSHIHIKO,
YOSHIGA YASUHIKO,
HAYANO TOMOKO,
OHMURA MASATO,
KIMURA MASAYASU,
ITAGAKI KAZUO,
MATSUZAKI MASUNORI
Publication year - 2000
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1046/j.1460-9592.2000.01691.x
Subject(s) - medicine , reentry , qrs complex , cardiology , orthodromic , ventricle , antidromic , ventricular tachycardia , anesthesia , stimulation
SHIMIZU, A., et al. : Double Ventricular Response by a Single Ventricular Extrastimulus to the Inner Loop of Reentry in a Patient Without Apparent Heart Disease. In a patient without apparent heart disease, a ventricular extrastimulus delivered from the left ventricular apex where the electrogram was recorded 30 ms after the onset of the QRS complex during VT advanced the second QRS complex, but not the first QRS complex. The morphology of the second QRS complex was the same as that of VT. The postpacing interval was the same as the cycle length of the VT. These findings indicated that the site of stimulation was at the inner loop of the reentry circuit of the VT. A ventricular extrastimulus with a shorter coupling interval advanced the first and second QRS complexes, indicating that the ventricle was activated by antidromic and orthodromic activation from the extrastimulus. Radiofrequency ablation at that site of stimulation terminated the VT and no further VT could be induced.