PEBC Cardiology Practice Test

What is the normal QTc interval on an ECG?

<400-440 ms 400-480 ms 440-480 ms 300-350 ms

Correct Answer:

<400-440 ms

Explanation:

Normal QTc reflects the time of ventricular depolarization and repolarization corrected for heart rate. In adults, a QTc under about 440 ms is generally regarded as normal (with some guidelines allowing up to ~460 ms in women). Prolonged QTc, which increases risk of torsades de pointes, is usually above roughly 450–460 ms depending on sex. That makes the interval described as less than 440 ms the best fit for normal. Values around 400–480 ms can be borderline or prolonged, and 440–480 ms is not considered normal in most contexts, while 300–350 ms is abnormally short.

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