Accuracy of QT interval measurement on electrocardiographs displayed on electronic 'smart' devices

Joe Anthony Rotella, David McD Taylor, Anselm Wong, Shaun L. Greene

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)


Objective: The objective of the study was to compare QT intervals measured on the original bedside electrocardiographs (ECG), facsimile, iPhone, iPad and 17 inch computer monitor. Methods: This was a prospective, observational study conducted within a tertiary referral metropolitan ED. Thirteen doctors measured the QT intervals of 15 non-identifiable, routinely recorded ECGs using randomly allocated modalities over five sessions. The QT intervals of lead I, II, V2, V4, V6 and one other were measured. Variations between modalities and between doctors were examined (χ2 and Kruskal-Wallis tests). Results: QT intervals measured on the iPad were significantly lower than the other modalities (P=0.02). For each lead, there were no differences in QT interval measurement between the modalities (P>0.05). However, there were significant differences between the QT interval measurements of the participating doctors (range of median QT intervals 480-530 msec, P

Original languageEnglish
Pages (from-to)187-192
Number of pages6
JournalEmergency Medicine Australasia
Issue number2
Publication statusPublished - Apr 2016
Externally publishedYes


  • Electrocardiograph
  • QT interval
  • Toxicology

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