The U wave, when first recognized by Since then the normality of upright U waves, except perhaps in cases where they are unusually high Various hypotheses have been advanced to explain the U wave, of which the most satisfactory is that of Hoff and Nahum (1938) who concluded on experimental grounds that it undoubtedly forms part of the ventricular complex, and is coincident in time with the supernormal phase.
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J. H. Palmer (1948) studied this question.
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