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

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

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

2 Citations (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.
Original languageEnglish
Title of host publicationConference proceedings (IEEE Engineering in Medicine and Biology Society. Conf.)
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
Number of pages4
Publication statusPublished - 2006

Publication series

ISSN (Print)1557-170X

Subject classification (UKÄ)

  • Cardiac and Cardiovascular Systems
  • Respiratory Medicine and Allergy


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