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(A) Individual values of deltaT50 during the day versus corresponding values of QTcF in healthy volunteers (HV, filled circles) and in patients with different forms of long QT syndrome, LQTS1, LQTS2, LQTS3, and JLN. (B) The same values as in Panel A, but only for the HV and LQTS patients who had QTcF intervals <450 ms and deltaT50 <3 ms. ECGs annotated with symptoms are marked with a ring.
