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Titolo:
Using simulated noise to define optimal QT intervals for computer analysisof ambulatory ECG
Autore:
Tikkanen, PE; Sellin, LC; Kinnunen, HO; Huikuri, HV;
Indirizzi:
Univ Oulu, Dept Phys Sci, Div Biophys, FIN-90570 Oulu, Finland Univ Oulu Oulu Finland FIN-90570 i, Div Biophys, FIN-90570 Oulu, Finland Oulu Univ Hosp, Dept Cardiol, FIN-90220 Oulu, Finland Oulu Univ Hosp Oulu Finland FIN-90220 t Cardiol, FIN-90220 Oulu, Finland
Titolo Testata:
MEDICAL ENGINEERING & PHYSICS
fascicolo: 1, volume: 21, anno: 1999,
pagine: 15 - 25
SICI:
1350-4533(199901)21:1<15:USNTDO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
VENTRICULAR REPOLARIZATION DURATION; HEART-RATE-VARIABILITY; MYOCARDIAL-INFARCTION; HOLTER RECORDINGS; ARRHYTHMIAS; PERFORMANCE; ALGORITHM; ACCURACY; POINT;
Keywords:
QT interval variability; automatic ECG analysis; timing precision; oversampling; ECG waveform detection; simulated noise;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Sellin, LC Univ Oulu, Dept Phys Sci, Div Biophys, FIN-90570 Oulu, Finland Univ Oulu Oulu Finland FIN-90570 hys, FIN-90570 Oulu, Finland
Citazione:
P.E. Tikkanen et al., "Using simulated noise to define optimal QT intervals for computer analysisof ambulatory ECG", MED ENG PHY, 21(1), 1999, pp. 15-25

Abstract

The ambulatory electrocardiogram (ECG) is an important medical tool, not only for diagnosis of adverse cardiac events, but also to predict the risk of such events occurring. The 24-hour ambulatory ECG has certain problems and drawbacks because the signal is corrupted by noise from various sources and also several other conditions which may alter the ECG morphology. We have developed a Windows based program for the computer analysis of ambulatoryECG which attempts to address these problems. The software includes options for importing ECG data, different methods of waveform analysis, data-viewing, and exporting the extracted time series. In addition, the modular structure allows for flexible maintenance and expansion of the software. The ECG was recorded using a Holter device and oversampled to enhance the fidelity of the low sampling rate of the ambulatory EGG. The influence of different sampling rates on the interval variability were studied. The noise sensitivity of the implemented algorithm was tested with several types of simulated noise and the precision of the interval measurement was reported with SDvalues. Our simulations showed that, in most of the cases, defining the end of QT interval at the maximum of the T wave gave the most precise measurement. The definition of the onset of the ventricular repolarization duration is most precisely made on the maximum or descending maximal slope of the R wave. We also analyzed some examples of time series from patients using power spectrum estimates in order to validate the low level QT interval variability. (C) 1999 IPEM. Published by Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/08/20 alle ore 11:03:12