The QT interval varies with the heart rate. The upper limit of normal in women is around 460-470 msec. Measurement of QT interval is often difficult since the end of the T wave may be difficult to identify precisely. In addition, abnormalities of electrolytes and medications may also prolong the QT. In your example, please discuss with your doctor since there are too many unknown elements.
Answered 8/2/2021
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