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Figure 2 Distribution of successful ablation sites. This Figure depicts all target sites with subsequent abolition of atrioventricular nodal re-entrant tachycardia in patients undergoing the conventional approach (group A, open circles) and STS-guided ablation strategy (group B, solid circles). There is a well-balanced distribution of target sites from the posteroseptal aspect around the coronary sinus ostium up to the lower midseptal region in both groups. Solid circle = STS, n = 50; open circle = conventional, n = 50. AVN = atrioventricular node; CS = coronary sinus; TA = tricuspid annulus.