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T Wave Alternans in Idiopathic Long‐QT Syndrome: Insight from Body Surface Mapping
Author(s) -
SHIMIZU WATARU,
KAMAKURA SHIRO,
ARAKAKI YOSHIO,
KAMIYA TETSURO,
SHIMOMURA KATSURO
Publication year - 1996
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1996.tb03426.x
Subject(s) - medicine , t wave alternans , cardiology , qt interval , long qt syndrome , body surface , sudden cardiac death , geometry , mathematics
Body surface mapping was recorded during T wove alternans in two patients with idiopathic long QT syndrome. Eighty‐seven had ECGs of two consecutive beats during T wave alternans demonstrated that alternating changes in the morphology and polarity of the T wave existed mainly in the left frontal chest. The QRST isointegral maps of the same two consecutive beats showed alternation of a large negative area appearing mainly in the left frontal chest. These results indicate that T wave alternans in the two patients were related to alternate heterogeneous prolongation of the action potential duration in this region.