<P> Radiofrequency ablation has revolutionized the treatment of tachycardia caused by a re-entrant pathway . This is a low - risk procedure that uses a catheter inside the heart to deliver radio frequency energy to locate and destroy the abnormal electrical pathways . Ablation has been shown to be highly effective: around 90% in the case of AVNRT . Similar high rates of success are achieved with AVRT and typical atrial flutter . </P> <P> Cryoablation is a newer treatment for SVT involving the AV node directly . SVT involving the AV node is often a contraindication for using radiofrequency ablation due to the small (1%) incidence of injuring the AV node, requiring a permanent pacemaker . Cryoablation uses a catheter supercooled by nitrous oxide gas freezing the tissue to − 10 ° C (+ 14.0 oF). This provides the same result as radiofrequency ablation but does not carry the same risk . If it is found that the wrong tissue is being frozen, the freezing process can quickly be stopped and the tissue return to normal temperature and function in a short time . If after freezing the tissue to − 10 ° C the desired result is obtained, the tissue can be further cooled to a temperature of − 73 ° C (- 99.4 oF) and it will be permanently ablated . </P> <P> This therapy has further improved the treatment options for people with AVNRT (and other SVTs with pathways close to the AV node), widening the application of curative ablation to young patients with relatively mild but still troublesome symptoms who would not have accepted the risk of requiring a pacemaker . </P> <P> After being successfully diagnosed and treated, Bobby Julich went on to place third in the 1998 Tour de France and win a Bronze Medal in the 2004 Summer Olympics . Women's Olympic volleyball player Tayyiba Haneef - Park underwent an ablation for SVT just two months before competing in the 2008 Summer Olympics . Tony Blair, former PM of the UK, was also operated on for atrial flutter . Anastacia was diagnosed with the disease . Women's Olympic gold medalist swimmers, Rebecca Soni and Dana Vollmer have both had heart surgery to correct SVT . In addition, Neville Fields had corrective surgery for SVT in early 2006 . Wrestling manager Paul Bearer's heart attack was attributed to SVT, resulting in his death . Nathan Cohen, New Zealand's two - time world champion and Olympic champion rower, was diagnosed with SVT in 2013 when he was 27 years old . </P>

Which of the following is an example of an atrial tachycardia