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The negative U wave has been studied in 200 electrocardiograms. Six different types of negativity of the U wave are recognized; a seventh type includes the alterations of the T-U segment. Electrocardiographic and clinical data are correlated with these changes. Two hypotheses to explain the varying morphology of the negative U wave are discussed.

Morphologic Aspects of the Negativity of the U Wave and their Corresponding Electrocardiographic and Clinical Data