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In page Catheter ablation:

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Catheter ablation of most arrhythmias has a high success rate. Success rates for Wolff–Parkinson–White syndrome (WPW) have been as high as 95% [1] For supraventricular tachycardia (SVT), single procedure success is 91% to 96% (95% Confidence Interval) and multiple procedure success is 92% to 97% (95% Confidence Interval).[2] For atrial flutter, single procedure success is 88% to 95% (95% Confidence Interval) and multiple procedure success is 95% to 99% (95% Confidence Interval).[2] For automatic atrial tachycardias, the success rates are 70–90%.[citation needed] The potential complications include bleeding, blood clots, pericardial tamponade, and heart block, but these risks are very low, ranging from 2.6 to 3.2%.