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lüll QT interval prolongation as a biomarker for torsades de pointes and sudden death in drug development Sides GDDis Markers 2002[]; 18 (2): 57-62Prolongation of the QT interval on the surface 12-lead electrocardiogram is widely accepted as a biomarker for the potential of a drug to produce torsades de pointes and/or sudden death. Detection of drug-induced prolongation of the QT interval in animals and man is frequently confounded by extrinsic and intrinsic factors that limit the ability to detect a true drug effect. In particular drugs that increase heart rate show an apparent increase in QT interval that confounds assessment of a true drug effect on cardiac ventricular repolarization. The basis for the use of the QT interval as a biomarker will be examined.|*Biomarkers[MESH]|*Drug Design[MESH]|Animals[MESH]|Death, Sudden, Cardiac/*etiology[MESH]|Electrocardiography/*drug effects[MESH]|Female[MESH]|Humans[MESH]|Male[MESH]|Sex Factors[MESH]|Torsades de Pointes/*chemically induced[MESH] |