Initial ECG. The patient is in normal sinus rhythm. There is a nonspecific T wave abnormality characterized by flattened and poorly defined T waves. There is the suggestion of a bifid character to the T waves in the high lateral and anterolateral leads (arrows). The QT is prolonged, and was read by the instrument as 444 milliseconds (ms), with a corrected QT (QTc) of 509 ms. (A QTc above 480 ms for postpubertal females is considered prolonged.) However, the T wave morphology renders accurate measurement of the QT interval difficult.

Initial ECG. The patient is in normal sinus rhythm. There is a nonspecific T wave abnormality characterized by flattened and poorly defined T waves. There is the suggestion of a bifid character to the T waves in the high lateral and anterolateral leads (arrows). The QT is prolonged, and was read by the instrument as 444 milliseconds (ms), with a corrected QT (QTc) of 509 ms. (A QTc above 480 ms for postpubertal females is considered prolonged.) However, the T wave morphology renders accurate measurement of the QT interval difficult.