The U wave in atrial fibrillation

Langley, Philip; Bourke, John P; Murray, Alan

Abstract

The U wave in ECGs of patients is difficult to observe because it is hidden under the atrial fibrillatory wave. Measurement and characteristics of the U wave in atrial fibrillation have not previously been described. Beat averaging was used to reveal the U waves in 12-lead ECGs of 8 patients with atrial fibrillation taking account of heart rate dependency of U wave characteristics. U wave polarity and amplitude in 12-lead ECG and the amplitude ratio of U wave to atrial fibrillatory wave in lead VI were measured. U waves were measureable in all patients. U waves were predominantly positive in leads 1. 11. aVF. V2. V3, V4, V5 and V6, negative in leads aVR. Amplitudes were largest in the precordial leads measuring up to 55 fJ V. In lead VI the U wave amplitude was on average 0.17 (range 0.1 to 0.4) times the amplitude of the atrial fibrillatory wave. U waves can be measured by ventricular beat averaging in AF patients. U waves were normal in this small group of patients.

Citation

Langley, P., Bourke, J. P., & Murray, A. The U wave in atrial fibrillation. Presented at 2015 Computing in Cardiology Conference (CinC)

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 2015 Computing in Cardiology Conference (CinC)
• Online Publication Date: Feb 18, 2016
• Publication Date: Feb 16, 2016
• Deposit Date: Apr 22, 2016
• Publicly Available Date: Apr 22, 2016
• Journal: Computing in cardiology
• Print ISSN: 2325-8861
• Peer Reviewed: Peer Reviewed
• Volume: 42
• Pages: 833-836
• ISBN: 9781509006854; 9781509006847
• DOI: https://doi.org/10.1109/cic.2015.7411040
• Keywords: Atrial fibrillation, U wave, ECG
• Public URL: https://hull-repository.worktribe.com/output/436716
• Publisher URL: http://www.cinc.org/archives/2015/pdf/0833.pdf
• Additional Information: This is a copy of an article published in Computing in cardiology, 2014, v.42.
• Contract Date: Apr 22, 2016