Accuracy of QT Measurement in the EASI-derived 12-lead ECG

J P Martinez, P Laguna, S Olmos, Olle Pahlm, J Petersson, Leif Sörnmo

Forskningsoutput: Kapitel i bok/rapport/Conference proceedingKonferenspaper i proceedingPeer review

2 Citeringar (SciVal)


The purpose of this study is to assess QT interval
measurements from the EASI 12-lead ECG as compared to the
standard 12-lead ECG. The QT interval was automatically
measured in simultaneously recorded standard and EASI 12-
lead ECGs, using a validated wavelet-based delineator. The
agreement between the two sets of measurements was
quantified both on a lead-by-lead basis and a multilead basis.
The results show an acceptable agreement between QT
measurements in the two lead systems, with correlation
coefficients (CC) 0.91-0.98 depending on the lead. Standard
deviations range from 9.2 ms to 26.4 ms depending on the
selected lead. In a few patients large inter-system differences were found, mainly due to different T wave morphologies. Using a multilead delineation, QT intervals were considerably more stable than single-lead measurements and resulted in a much better agreement between the two lead systems (CC: 0.98, QT difference: 1.1 ms ± 9.8 ms). Thus, EASI-derived 12- lead ECG may be used for reliable QT monitoring when the multilead delineation approach is adopted.
Titel på gästpublikationConference proceedings (IEEE Engineering in Medicine and Biology Society. Conf.)
FörlagIEEE - Institute of Electrical and Electronics Engineers Inc.
Antal sidor4
StatusPublished - 2006


ISSN (tryckt)1557-170X

Ämnesklassifikation (UKÄ)

  • Kardiologi
  • Lungmedicin och allergi


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