Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
U wave alternans
Introduction
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
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]