NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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QT Prolongation is considered prolonged when QT interval is greater than how many milliseconds?

  1. 440 ms

  2. 500 ms

  3. 350 ms

  4. 400 ms

The correct answer is: 440 ms

The QT interval on an ECG represents the time it takes for the ventricles of the heart to contract and relax. A prolonged QT interval can be a sign of an underlying heart condition and can increase the risk of dangerous heart rhythms. A normal QT interval is typically between 350-440 milliseconds, with a value above 440 milliseconds considered prolonged. Therefore, options B, C, and D are incorrect as they do not fall within the normal or prolonged range of QT interval.

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