Abstract

A drug dose (and con-centration) that produces minimal QT prolongation in onepatient may, in an apparently indistinguishable subject, pro-duce marked QT prolongation and torsade de pointes. Thisvariability in response to an exogenous stressor is paralleledby variability in the extent to which a given mutation in thecongenital long-QT syndrome prolongs QT interval andcauses arrhythmias.

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