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Correspondence
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Volume 350:1156 March 11, 2004 Number 11
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Hypokalemia

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by Nosworthy, A.
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To the Editor: In an Image in Clinical Medicine, Nosworthy (Nov. 27 issue)1 shows an electrocardiogram from a patient with hypokalemia and describes a prolonged QT interval. However, the corrected QT interval (QTc) of the electrocardiogram shown is approximately 0.416 second, which is normal. The QTc is defined as the QT interval measured from the start of the Q wave to the end of the T wave, divided by the square root of the RR interval. The normal QTc should be 0.38 to 0.46 second. I suspect that the author mistakenly measured the QU interval, rather than the QT interval, . . . [Full Text of this Article]



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