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The aim of this study is to evaluate the clinical characteristics of idiopathic outflow ventricular arrhythmias (OVAs).
We analyzed the clinical data of the patients who were defined as OVAs by electrophysiology test (EPs) and radiofrequency ablation (RFCA) in our center in the past 3 years. Structure heart diseases including inherited primary arrhythmia syndromes were ruled out in these patients.
Among 1428 patients who performed EPs and RFCA in our center with VAs, 927 patients (398 males, age 42.2±12.6 years) were diagnosis as idiopathic OVAs. Palpitation (81.9%), dizziness (50.1%) were the most common symptoms, and other symptoms could be tolerated, however, ventricular fibrillation or cardiac arrest (0.3%) occurred in 3 patients. Right-sided OVAs were obviously more than left-sided ones, which was account for 85% (788/927). Pulmonary arteriography was used in the latter 218 Right-sided OVAs procedures to guide ablation and to confirm the successful ablation site, indicating that 24 VAs (11%) arose from pulmonary sinus cusp(PSC) which could not be eliminated by ablating the beneath side. The 1-year success rate was 91.7% overall. One patient developed pericardial tamponade in the procedure and recovered after conservative treatment.
In most cases, idiopathic OVAs caused tolerable symptoms and can be treated by RFCA effectively and safely. Pulmonary arteriography may be helpful in cases of failure ablation beneath PSC.