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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 NL3000 DRROTTERDAM NETHERLANDS
 Titolo Testata:
 HEART
fascicolo: 5,
volume: 80,
anno: 1998,
pagine: 453  458
 SICI:
 13556037(1998)80:5<453:MEAASO>2.0.ZU;2I
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 ACUTE MYOCARDIALINFARCTION; INTERVAL DISPERSION; 12LEAD ELECTROCARDIOGRAM; HEALTHYSUBJECTS; HEARTFAILURE; 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. 453458
Abstract
ObjectiveTo 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. SubjectsMeasurements were done on 1220 standard simultaneous 12 lead electrocardiograms. DesignThe 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 STT 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 measuresMean and standard deviation of error in measuring QT duration, QTD(5), and QTD(12). ResultsPerformance 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 STT 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. ConclusionsThe 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 STT amplitude. QTD measurement error is large compared with typical QTD values reported.
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Documento generato il 14/08/20 alle ore 15:48:38