Dr. Macking and Young Reply

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Sir: We thank Dr. Vieweg for his comments regarding our recent article.1 Dr. Vieweg is correct to state that serum potassium concentration has an important bearing on cardiac repolarization, a fact about which we are well aware. There are also a number of other risk factors for cardiac repolarization abnormalities that have been reviewed elsewhere.2

J Clin Psychiatry 2006;67(5):839-839