The U Wave in Atrial Fibrillation

Langley, P; Bourke, JP; Murray, A

doi:10.1109/CIC.2015.7411040

The U Wave in Atrial Fibrillation

Lookup NU author(s): Dr Philip Langley, Dr John Bourke, Emeritus Professor Alan Murray ORCiD

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Abstract

The U wave in EC"Gs of patients is difficult to observe because it is hidden under the atrial fibrillatoly ifl Meastirement and characteristics of the U Wave in atrial fibrillation have not previously been described. 13eat averaging was used to reveal the U waves in 12 lead EGGS of 8 patients with atrial fibrillation taking account of heart rate dependency of U wave characteristics. LI wave polarity and amplitude in 12-lead ECG and the amplitude ratio of U wave to atrial fibrillatory Wave in lead 171 were measured. U waves were measureable in all patients. LI waves were predominantly positive in /'t,/ I II, cif /F., V2, 1/3, 174, I/5 and V6, neat/v,' in leads aVR. Amplitudes W ere largest in the precorclial lecids measuring up to 55 kir,In lead 171 the I wave amplitude was on average 0.17 (range 0,1 to (1.4) times the amplitude of the atrial fibrillatory W cite. U waves can be measured by ventriculctr beat averaging in AF patients. U waves were normal in this small group ti it