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Changes in Repolarization Properties with Long‐Term Cardiac Memory Modify Dispersion of Repolarization in Patients with Wolff‐Parkinson‐White Syndrome
Author(s) -
TAKADA YASUNOBU,
INDEN YASUYA,
AKAHOSHI MAKOTO,
SHIBATA YOSHIHISA,
SHIMIZU ATSUYA,
YOSHIDA YUKIHIKO,
YAMADA TAKUMI,
TSUBOI NAOYA,
HIRAYAMA HARUO,
ITO TERUO,
KONDO TAKAHISA,
SAITO HIDEHIKO,
HIRAI MAKOTO
Publication year - 2002
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1046/j.1540-8167.2002.00324.x
Subject(s) - medicine , repolarization , cardiology , ablation , catheter ablation , accessory pathway , dispersion (optics) , catheter , electrocardiography , anesthesia , surgery , electrophysiology , physics , optics
Cardiac Memory Modifies Repolarization Dispersion.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 (W T ), from 87‐lead body surface maps before, 1 day after, and 7 days after catheter ablation. RT dispersion and W T were significantly correlated before, 1 day after, and 7 days after catheter ablation ( r = 0.78 ). In patients with preexcitation, RT dispersion and W T 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 W T 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.