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T wave alternans in idiopathic long-QT syndrome: insight from body surface mapping
W Shimizu1, S Kamakura, Y Arakaki
1Department of Internal Medicine, National Cardiovascular Center, Osaka, Japan.
Pacing and Clinical Electrophysiology : PACE
|July 1, 1996
Abstract:
Body surface mapping was recorded during T wave alternans in two patients with idiopathic long QT syndrome. Eighty-seven lead 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.