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1 Division of Cardiology, Department of Medicine, George Washington University Medical Center and the District of Columbia General Hospital, Washington, D.C.
Electrical alternation of a single electrocardiographic wave is rare and has not been adequately explained. We describe a case of U wave alternans associated with extreme ventricular irritability. Relationship to hypomagnesemia is indicated by rapid response to magnesium therapy. Mechanisms that may be responsible for this phenomenon are discussed.
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