This study showed that (1) the prevalence of MVP in patients with Wolff-Parkinson-White syndrome and AV nodal reentrant tachycardia was similar to that of the general population; (2) the location of accessory pathways was not related to the presence of MVP; and (3) MVP was persistently present after elimination of preexcitation. These findings suggest that MVP may have an independent association with PSVT. The study limitations are: (1) Acquisition bias should be noted because the prevalence of PSVT in patients found to have MVP was not obtained. (2) Comparison between patients with PSVT and an ageand sex-matched population sample in whom MVP was assessed by identical methods was not performed; thus, the association between MVP and this family of arrhythmias was not obtained. Furthermore, the higher prevalence of MVP in patients with both accessory pathway-mediated and AV nodal reentrant tachycardia must be reassessed.
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