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Abstract Objective To explore the mode of onset of ventricular tachyarrhythmia (VTA) and its clinical significance. Methods Routine 12-lead electrocardiogram (ECG) or continuous ECG monitoring recorded just before, during and post VTA triggered by premature ventricular contraction (PVC) were analyzed in 84 patients. According to QT interval, coupling interval of PVC and the immediately preceding RR interval, they were divided into long QT with long RR interval group (n=49) and normal QT group(n=35)(8 cases with a long RR interval, 24 cases with a short coupling interval, 3 cases with a very short coupling interval). Results Torsade de pointes occurred frequently in long QT with long RR interval group, while ventricular fibril ation, polymorphic and monomorphic VTA were seen in normal QT group. Q-T (U) interval of basic rhythm and coupling interval of PVC were significantly longer in long QT with long RR interval group than in normal QT group. Conclusion VTA triggered by PVC has various ECG features and should be treated individual y.
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