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QT prolongation and Torsade-de-pointes (TdP) following Quinidine therapy. Marked QT prolongation (corrected QT, QTc 520 ms) and Torsade-de-pointes (TdP) following Quinidine therapy (dosage quinidine polygalacturonate 275 mg b. i.d, equivalent to quinidine sulfate 200 mg b. id.) recorded during Holter monitoring in a female patient (age 62 years) with history of paroxysmal atrial fibrillation.
