Figure 6From: Congenital long QT syndromeLQT3 patient aged 17-yrs, major QTc prolongation (QTc 516 ms) not modified by β-blocker therapy. The addition of oral chronic therapy with mexiletine (200 mg b.i.d.) produced a major shortening of QTc by over 100 ms persisting over time. (Reprinted from ref. [78] with permission from Elsevier).Back to article page