Authors: Zhihong Zhao Xuebing Li Jihong Guo
Publish Date: 2008/10/31
Volume: 24, Issue: 2, Pages: 89-94
Abstract
AT occurred spontaneously or was induced by isoproterenol infusion The tachycardia demonstrated a characteristic Pwave morphology and endocardial activation pattern The Pwave was highly positive in leads I II III aVF in all patients and isoelectric in lead aVL lead V1 showed biphasic positive then negative component in four of five patients Lead V2–V6 showed positive component in five patients and isoelectric in one patient The earliest endocardial activity occurred at the SVC ahead of Pwave in all five patients Mean tachycardia cycle length was 378 ± 18 ms and the earliest endocardial activation at the successful RFA site occurred 353 ± 84 ms before the onset of Pwave at 2 ± 1 cm above the SVC–right atrium junction located at the anterior and lateral wall aspect of the SVC RFA was acutely successful in all five patients except one patient accompanied with sick sinus syndrome Longterm success was achieved in five of five over a mean followup of 24 ± 5 months range 12–36 monthsThe SVC is an uncommon site of origin for focal AT 17 There were consistent Pwave morphology and endocardial activation associated with this type of AT The SVC focal ablation is safe and effective Longterm success was achieved with focal ablation in all patients
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