Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
MEASUREMENT ERROR AS A SOURCE OF QT DISPERSION - A COMPUTERIZED ANALYSIS
Autore:
KORS JA; VANHERPEN G;
Indirizzi:
ERASMUS UNIV,FAC MED & HLTH SCI,DEPT MED INFORMAT,POB 1738 NL-3000 DRROTTERDAM NETHERLANDS
Titolo Testata:
HEART
fascicolo: 5, volume: 80, anno: 1998,
pagine: 453 - 458
SICI:
1355-6037(1998)80:5<453:MEAASO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACUTE MYOCARDIAL-INFARCTION; INTERVAL DISPERSION; 12-LEAD ELECTROCARDIOGRAM; HEALTHY-SUBJECTS; HEART-FAILURE; CARDIAC DEATH; REPRODUCIBILITY; CARDIOMYOPATHY; VARIABILITY; REDUCTION;
Keywords:
AUTOMATED ECG ANALYSIS; QT MEASUREMENT; QT DISPERSION; MEASUREMENT ERROR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Kors e G. Vanherpen, "MEASUREMENT ERROR AS A SOURCE OF QT DISPERSION - A COMPUTERIZED ANALYSIS", HEART, 80(5), 1998, pp. 453-458

Abstract

Objective-To establish a general method to estimate the measuring error in QT dispersion (QTD) determination, and to assess this error using a computer program for automated measurement of QTD. Subjects-Measurements were done on 1220 standard simultaneous 12 lead electrocardiograms. Design-The computer program was validated against two observers on a random subset of 100 electrocardiograms. Simple laws of physics require that at least five of the six extremity reads have the same QT duration. This allows the direct assessment of the error in measuring QTD derived from five extremity leads (QTD(5)). It also enables ST-T amplitude dependent distributions of measurement error in determining QTduration to be established. These QT error distributions were then used to estimate the error in measuring QTD from all 12 leads (QTD(12)). Main outcome measures-Mean and standard deviation of error in measuring QT duration, QTD(5), and QTD(12). Results-Performance of the program was comparable to that of observers. Errors in measuring QT duration(measured QT minus reference QT) fell from a mean (SD) of 6.9 (17.1) ms for ST-T amplitudes < 50 mu V to -1.4 (6.3) ms for amplitudes > 350mu V. Measurement errors of QTD(5) and QTD(12) were 20.4 (11.5) ms and 29.4 (14.9) ms. Conclusions-The fact that no QTD can exist between five of the six extremity leads provides a means of estimating QTD measurement error. Measuring error of QT duration is dependent on ST-T amplitude. QTD measurement error is large compared with typical QTD values reported.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 00:21:22