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Glossary Health & Fitness

QT interval and QTc

The QT interval is the time on an ECG from the start of the heart's electrical contraction to the end of its recovery; QTc corrects it for heart rate.

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In more detail

Bazett's formula is QT / √RR and Fridericia's is QT / ∛RR, with RR in seconds. A QT of 400 ms at 75 beats a minute corrects to 447 ms (Bazett) or 431 ms (Fridericia). Interpretation belongs to a clinician.

Try these tools

QTc Calculator

Correct the QT interval for heart rate with the Bazett, Fridericia, Framingham and Hodges formulas, from heart rate or RR interval.

See also

  • Glossary Mean arterial pressure (MAP)
    Mean arterial pressure is the average blood pressure during one heartbeat cycle, `diastolic + (systolic − diastolic) / 3`.
  • Cheat sheet Medical Formulas Cheat Sheet
    A1C to glucose, blood pressure bands, cholesterol, kidney function, QTc, blood alcohol and IV drip rate with worked examples.
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