The purpose of this study is to compare the safety and effectiveness of cryoablation and radiofrequency ablation in the treatment of the commonest kind of supraventricular tachycardia, namely atrioventricular nodal reentrant tachycardia. The study hypothesis is that cryoablation is non-inferior to radiofrequency.
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treatment success rate, defined as proportion of treated patients with both atrioventricular block-free acute procedural success and mid-term success without recurrence at 6 months
Timeframe: 6 months after treatment