J.L. Alonso, P. Martinez*, X.Vinolas, M. Vallverdu*, M.V. Pitzalis**, W.Zareba***, P. Rizzon**, P. Caminal*, R.Jané*, P.Laguna****, A. Bayés de Luna.
Hospital Santa Creu i Santa Pau, Barcelona, Spain, *Dep. ESAII, Centre de Recerca en Enginyeria Biomedica, Univ. Politec. de Catalunya, **Institute of Cardiology, Univ. Bari, Italy; ***Univ. Rochester, USA; ****Dep. Ing. Electr.y Comunic., Univ. Zaragoza, Spain
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We have automatically analyzed the QTd and its dynamic behaviour
in 24 hours digital Holter recordings (200 Hz-Burdik, USA) of 55 Idiopathic Dilated Cardiomyo-pathy patients (IDC),
27 Coronay Artery Disease patients (CAD) and 60 healthy subjects (NRM) from the IDEAL database.
The algorithm, which uses the first derivative of ECG signal to detect the QTend, performs a beat to beat analysis
of the QT dispersion three-lead (X, Y, Z) Holter recordings.
The analysed parameters are the mean and standard deviation of RR, QT, QTc (QT corrected by Bazzet’s formula)
and QTd, as well as the percentage of beats with QTc >500 (peaks of QTc), and the percentages of beats with
QTd greater than different thresholds (peaks of QTd).
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