title: [A method for measuring QT and T duration and beat to beat variability].
abstract: The QT interval duration is an important non-invasive electrophysiological parameter that reflects ventricular depolarization and repolarization time. A knowledge of QT variability also provides specific information on the normal and pathological ventricular myocardium, and the influence of the autonomic nervous system. A numerical algorithm was developed for measuring QT interval and T-wave duration in the surface electrocardiogram. In comparison with numerous other approaches, this method calculates these durations without averaging of QRS complexes on a beat-to-beat basis. The main aim of this study was to assess the efficacy of this method for characterizing cardiac diseases. In 6 patients with hypertrophic cardiomyopathy and a control group of 5 healthy, age-matched subjects, different interval durations were calculated. In contrast to the mean QT interval duration, only the T-wave duration differed significantly between the two groups.
authors.affiliation: Fachhochschule Jena.
authors.forename: H
authors.initials: H
authors.lastname: Neupert
authors.forename: A
authors.initials: A
authors.lastname: Voss
mesh_terms: D000465:Algorithms; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis / Q000503:physiopathology; D004562:Electrocardiography / Q000295:instrumentation*; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*
vernacular_title: Methode zur Messung der QT- und T-Dauer und der Beat-to-beat-Variabilität.