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Author Bruno, Js ♦ Soria, M. Llamedo ♦ Arini, Pd ♦ Taborda, Ram
Source CiteSeerX
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Rate Change ♦ Rr Andqt Interval ♦ Qt Correction ♦ Asymptotic Value ♦ Sam-pling Rate ♦ Qrs Complex ♦ Individual Method ♦ Qt Inter-val ♦ Qrs Complex Duration ♦ Elec-trical Cardiac Activity ♦ Surface Ecg ♦ Postural Change ♦ Qt Interval ♦ Cubic Spline Interpolation ♦ Exponential Decay Func-tion ♦ Precise Measurement ♦ Different Technique ♦ Different Ecg Sampling Rate ♦ Minimum Sampling Rate ♦ Qrs Com-plex Duration ♦ Ecg Recording ♦ Pharmacologi-cal Blockage
Description The precise measurement of QT interval and QRS complex duration is important to characterize the elec-trical cardiac activity of the surface ECG. Variations of these intervals were evaluated when ECG sampling rate changes. The ECG recordings used in this study (n = 78) were obtained from a combination of pharmacologi-cal blockage and postural changes. The ECG recordings were originally sampled at 500 Hz, and then were down-sampled by intervals of 25 Hz until the minimum sampling rate of 75 Hz. In all cases the down-sampling was imple-mented using cubic spline interpolation. The QRS com-plex duration, RR andQT intervals for each subject, con-dition and sampling rate were measured. The QT inter-val was corrected using two different techniques: Bazzett and individualized QT corrections. The effect of the sam-pling rate was modeled with an exponential decay func-tion, which was used later to measure where the exponen-tial reaches an asymptotic value (at 5τ). The 5τ value for uncorrectedQT was at 290 Hz, correctedQT with Bazzett was at 303 Hz, and corrected QT with Individual method was at 253 Hz, finally QRS complex duration was at 297 Hz. An overestimation of the QT interval and QRS com-plex duration was observed when decreasing the sampling rate below 300 Hz. 1.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Institution Computers in Cardiology, Vol.35, 2005