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Figure 2 Twenty-four-lead ECGs (G–K: 2–6) under baseline condition (A) and during epinephrine infusion (B) in a patient (pt) with LQT2 syndrome. A representative ECG (I4) is shown on the upper trace in each panel. The ECGs showed low-amplitude T wave with a notched appearance commonly seen in LQT2 patients. The QTc-e and QTc-p were prolonged (518, 414 ms1/2) and the Tcp-e was increased (104 ms1/2) under the baseline condition (A). Epinephrine produced a moderate prolongation in the QTc-e (618 ms1/2) and the QTc-p (494 ms1/2), resulting in a mild increase in the Tcp-e (124 ms1/2) (B).
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