U wave alternans
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Synonyms and keywords: Related chapter: electrical alternans
Overview
Overview
U wave alternans is defined as beat to beat variation in the amplitude or axis of the U wave.
Classification
Classification
U wave alternans is one of several types of repolarization alternans which also includes ST segment alternans and T wave alternans.
Pathophysiology
Pathophysiology
The underlying molecular mechanism is thought to involve abnormalities in calcium handling.
Epidemiology and Demographics
Epidemiology and Demographics
U wave alternans is very rare.
Natural History, Complications, Prognosis
Natural History, Complications, Prognosis
U wave alternans has been associated with an increased susceptibility to ventricular arrhythmias.[2][3]
Treatment
Treatment
Repletion of magnesium and calcium reversed the electrocardiographic abnormality and reduced ventricular irritability. [4]
References
References
- ↑ Mullican WS Jr, Fisch C: Post extrasystolic alternans of the U wave due to hypokalemia. Am Heart J 68:383, 1964.
- ↑ Mullican WS Jr, Fisch C: Post extrasystolic alternans of the U wave due to hypokalemia. Am Heart J 68:383, 1964.
- ↑ Tali Bashour; Jorge C. Rios; Patrick A. Gorman. CHEST.1973;64(3):377-379. doi:10.1378/chest.64.3.377
- ↑ Tali Bashour; Jorge C. Rios; Patrick A. Gorman. CHEST.1973;64(3):377-379. doi:10.1378/chest.64.3.377
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