CVS Practice Test 2026 – Complete Exam Preparation

Question: 1 / 400

What is the normal QT interval duration?

0.12-0.20 seconds

0.05-0.10 seconds

0.26-0.45 seconds

The normal QT interval duration typically ranges from 0.36 to 0.44 seconds (360 to 440 milliseconds) in adults, depending on various factors, including heart rate and individual patient characteristics. Therefore, the choice indicating a duration between 0.26 to 0.45 seconds aligns most closely with the expected normal range, confirming that it is the correct answer.

It's important to note that the QT interval represents the time it takes for the heart's electrical system to depolarize and then repolarize during a heartbeat. A prolonged or shortened QT interval can indicate a risk for serious arrhythmias, making accurate measurement and understanding of this interval crucial in clinical settings.

The other options either understate or overstate the normal duration of the QT interval. Those less than 0.36 seconds don't reflect typical measurements seen in practice.

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0.32 seconds

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