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Corrected QT (Fridericia)

Heart-rate-corrected QT interval using a cube root.

Formula

QTc=QTRR3QTc = \frac{QT}{\sqrt[3]{RR}}

Variables

QTQT interval (s)
RRR-R interval (s)

Example

At RR = 1 s, QTc equals the raw QT

Did You Know?

Fridericia's cube-root correction is more reliable than the older Bazett formula at very high or very low heart rates.

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