Torsade de pointes is characterized by an electrocardiographic (ECG) pattern of nonuniform but still-organized electrical activity with progressive changes in morphology, amplitude, and polarity of the QRS complexes, the peaks of which twist around the isoelectric baseline before ending spontaneously. In classic torsade de pointes, the coupling interval of the first beat is long (see LQT1, 192500), whereas in this short-coupled variant, the coupling interval of the first beat is very short (summary by Leenhardt et al., 1994). [from
OMIM]