Changes in repolarization properties with long-term cardiac memory modify dispersion of repolarization in patients with Wolff-Parkinson-White syndrome

Yasunobu Takada, Yasuya Inden, Makoto Akahoshi, Yoshihisa Shibata, Atsuya Shimizu, Yukihiko Yoshida, Takumi Yamada, Naoya Tsuboi, Haruo Hirayama, Teruo Ito, Takahisa Kondo, Hidehiko Saito, Makoto Hirai

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Introduction: Transient T wave changes after cessation of preexcitation have been attributed to cardiac memory. However, there have been no reports on the effects of long-term cardiac memory on repolarization dispersion before and after catheter ablation in patients with Wolff-Parkinson-White (WPW) syndrome. Methods and Results: We investigated 47 patients with an accessory pathway (AP; 24 manifest left-sided, 14 manifest right-sided, and 9 concealed left-sided). Repolarization dispersion was analyzed by two methods, recovery time (RT) dispersion and newly proposed T wave width (WT), from 87-lead body surface maps before, 1 day after, and 7 days after catheter ablation. RT dispersion and WT were significantly correlated before, 1 day after, and 7 days after catheter ablation (r = 0.78). In patients with preexcitation, RT dispersion and WT increased significantly (P < 0.05) 1 day after catheter ablation (178 ± 32 msec and 172 ± 30 msec) compared with those before (154 ± 24 msec and 156 ± 18 msec) and 7 days after catheter ablation (147 ± 19 msec and 156 ± 16 msec), respectively. However, there were no significant changes in RT dispersion and WT before and after catheter ablation in concealed WPW syndrome. Conclusion: The findings suggest that the abrupt changes in activation sequence increase repolarization dispersion in the presence of previous cardiac memory, and that the dispersion decreases days or weeks after alteration of activation sequence by catheter ablation, with development of new cardiac memory in patients with manifest WPW syndrome.

Original languageEnglish (US)
Pages (from-to)324-330
Number of pages7
JournalJournal of cardiovascular electrophysiology
Volume13
Issue number4
DOIs
StatePublished - 2002
Externally publishedYes

Keywords

  • Ablation
  • Cardiac memory
  • Preexcitation
  • Repolarization dispersion

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