Background: To assess the diagnostic accuracy of a single-lead portable ECG device for measuring QTc-intervals in comparison with a standard 12-lead ECG.
Methods: Adult patients visiting the cardiology outpatient clinic for a 12-lead recording were also measured with a portable single-lead ECG recorder (HeartcheckTM). QTc-intervals were determined by two cardiologists. Perfect agreement was defined as a limit of ≤10 ms between the two measurement methods.
Results: Hundred one ECGs were recorded. QTc-interval mean differences between the two measurement methods was substantially outside our definition of perfect agreement (-31.9 [SD±41.3] ms).
Conclusion: In conclusion, the Heartcheck single-lead ECG device is not accurate for measuring QTc-intervals.
Keywords: QT-interval; QTc; cardiac monitoring; electrocardiography; portable device.
© 2019 The Authors. Annals of Noninvasive Electrocardiology Published by Wiley Periodicals, Inc.