Emergency medicine Australasia : EMA
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    Emerg Med Australas · Apr 2016 Observational StudyAccuracy of QT interval measurement on electrocardiographs displayed on electronic 'smart' devices.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. ⋯ The QT interval can be reliably measured using facsimile, iPhone and computer, but not the iPad. However, it varies between doctors. Lead V2 is recommended for QT interval measurement if only a single lead is to be used for clinical purposes.