Performance assessment of standard algorithms for dynamic R-T interval measurement: Comparison between R-T(apex) and R-T(end) approach

A. Porta, G. Baselli, F. Lombardi, S. Cerutti, R. Antolini, M. Del Greco, F. Ravelli, G. Nollo

Research output: Contribution to journalArticlepeer-review


Three automatic approaches to ventricular repolarisation duration measurement (R-T(apex), R-T(end threshold) and R-T(end fitting) methods) are compared on computer-generated and real ECG signals, in relation to their reliability in the presence of the most common electrocardiographic artefacts (i.e. additive broadband noise and additive and multiplicative periodical disturbances). Simulations permit the evaluation of the amount of R-T beat-to-beat variability induced by the artefacts. The R-T(end threshold) method performs better than the R-T(end fitting) one, and, hence, the latter should be used with caution when R-T(end) variability is addressed. Whereas the R-T(apex) method is more robust with regard to broadband noise than the R-T(end threshold) one, the reverse situation is observed in the presence of periodical amplitude modulations. A high level of broadband noise does not prevent the detection of the central frequency of underlying R-T periodical changes. Comparison between the power spectra of the beat-to-beat R-T variability series obtained from three orthogonal ECG leads (X,Y,Z) is used to assess the amount of real and artefactual variability in 13 normal subjects at rest. The R-T(apex) series displays rhythms at high frequency (HF) with a percentage power on the Z lead (57.1 ± 4.9) greater than that on the X and Y leads (41.9 ± 4.6 and 46.1 ± 4.9, respectively), probably because of respiratory-related artefacts affecting the Z lead more remarkably. More uniform HF power distributions over X,Y,Z leads are observed in the R-T(end threshold) series (31.8 ± 3.8, 39.2 ± 4.1 and 35.1 ± 4.2, respectively), thus suggesting minor sensitivity of the R-T(end threshold) measure to respiratory-related artefacts.

Original languageEnglish
Pages (from-to)35-42
Number of pages8
JournalMedical and Biological Engineering and Computing
Issue number1
Publication statusPublished - Jan 1998


  • Automatic R-T measurement
  • Q-T interval
  • R-T variability
  • Time- and frequency-domain analysis
  • Ventricular repolarisation duration

ASJC Scopus subject areas

  • Biomedical Engineering
  • Health Informatics
  • Health Information Management
  • Computer Science Applications
  • Computational Theory and Mathematics


Dive into the research topics of 'Performance assessment of standard algorithms for dynamic R-T interval measurement: Comparison between R-T(apex) and R-T(end) approach'. Together they form a unique fingerprint.

Cite this