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Figure 3 (A) Receiver operator characteristic curves obtained from the post-flecainide QTc in each lead. The value of the QTc interval in V₂ has the greatest accuracy in discriminating negative from positive electrocardiograms (ECG) (see text for details). (B) Distribution of QTc intervals in V₂ after flecainide administration. A QTc interval in V₂ of >464 ms in females and >442 ms in males identified a positive ECG with 100% sensitivity and specificity. Closed circles = females with a positive test; open circles = females with a negative test; closed triangles = males with a positive test; open triangles = males with a negative test.

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