Document Detail

Occult T wave alternans in long QT syndrome.
MedLine Citation:
PMID:  8853024     Owner:  NLM     Status:  MEDLINE    
T wave alternans that is visually apparent on the ECG is a known risk factor for sudden death in idiopathic long QT syndrome (LQTS). To determine if occult and visually undetectable forms of T wave alternans are also present in LQTS, we measured T wave alternans from a 16-year-old girl with LQTS during exercise using spectral analysis methods and a recording system designed to minimize exercise-related noise. While there was no alternans at rest, statistically significant, yet visually inapparent T wave alternans were measured both during exercise and recovery. Using identical recording techniques, no significant T wave alternans was detected from the subject's mother, who had a prolonged QT interval but was not experiencing arrhythmias, nor from five healthy volunteers with normal QT intervals. This report suggests that electrocardiographically occult, yet prognostically important forms of T wave alternans may be present in patients with LQTS.
S B Platt; J M Vijgen; P Albrecht; G F Van Hare; M D Carlson; D S Rosenbaum
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Publication Detail:
Type:  Case Reports; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of cardiovascular electrophysiology     Volume:  7     ISSN:  1045-3873     ISO Abbreviation:  J. Cardiovasc. Electrophysiol.     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-12-05     Completed Date:  1996-12-05     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9010756     Medline TA:  J Cardiovasc Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  144-8     Citation Subset:  IM    
Department of Medicine, Case Western Reserve University, Cleveland, Ohio, 441 USA.
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MeSH Terms
Exercise Test
Long QT Syndrome / diagnosis,  physiopathology*
Risk Factors
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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