What is normal QT?

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Prepare for the Electrophysiology Unit (EPU) 26.19 exam with our interactive quiz featuring flashcards and multiple choice questions. Check your understanding with hints and explanations for each question.

Multiple Choice

What is normal QT?

Explanation:
The QT interval reflects the time for ventricular depolarization and repolarization on the ECG. Normal values differ by sex because hormonal factors slightly affect repolarization: about 440 ms or less in men and about 460 ms or less in women. Values longer than these limits indicate prolonged repolarization and can increase the risk of dangerous rhythms such as torsades de pointes, especially with other risk factors. Clinically, QT is often corrected for heart rate (QTc), but the uncorrected thresholds commonly taught show these sex-specific upper limits, which is why the option with <440 ms for men and <460 ms for women is the best choice.

The QT interval reflects the time for ventricular depolarization and repolarization on the ECG. Normal values differ by sex because hormonal factors slightly affect repolarization: about 440 ms or less in men and about 460 ms or less in women. Values longer than these limits indicate prolonged repolarization and can increase the risk of dangerous rhythms such as torsades de pointes, especially with other risk factors. Clinically, QT is often corrected for heart rate (QTc), but the uncorrected thresholds commonly taught show these sex-specific upper limits, which is why the option with <440 ms for men and <460 ms for women is the best choice.

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