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Figure 3 Scatterplot showing the mean value ± SD of the stimulus-atrial–ventriculo-atrial (S-A–VA) interval (ms) for patients with either orthodromic reciprocating tachycardia (ORT) using a septal accessory pathway or atypical atrioventricular node re-entrant tachycardia (AVNRT). The line drawn at 85 ms represents the discriminant point distinguishing the two forms of long VA tachycardia.