An algorithm for the quantification of ST-T segment variability.
A template boundary algorithm which quantitatively determines repolarization (ST-T segment) variability in a normal population has been developed. The algorithm defines an initial ST-T template for comparison with successive beats. Variability is quantified using boundary limits around the template which are widened, when necessary, to included incoming ST-T segments. The boundaries at the end of each hour are stored and the collection of boundaries over a set of normal subjects quantifies the normal variation over the entire ST-T segment. The algorithm can be used to determine prospectively normal ST-T variability based on a regression analysis of R-wave or T-wave amplitude, and QT interval. Application of these boundary predictions should be useful in distinguishing repolarization changes secondary to ischemia from normal variability.
Department of Internal Medicine, University of Michigan, Ann Arbor 48109.
S E
SE
Greenhut
B H
BH
Chadi
J W
JW
Lee
J M
JM
Jenkins
J M
JM
Nicklas
D000465:Algorithms; D003327:Coronary Disease / Q000175:diagnosis / Q000503:physiopathology; D004562:Electrocardiography; D006801:Humans; D012016:Reference Values; D012984:Software