Satie et al proposed an equation for correcting the QT interval based on the heart rate. The study was done by the Framingham Heart Study.
Parameters:
(1) RR interval in seconds
(2) QT interval in seconds (according to Sagie et al)
linear corrected QT interval =
= (QT) + (0.154 * (1 - (RR interval))
Karkalainen et al noted that the equation worked for normal heart rates but failed at low or high rates. They proposed the following multiplier based on heart rate.
Heart Rate
Multiplier
< 60 beats per minute
0.116
60 to 100 beats per minute
0.156
> 100 beats per minute
0.384
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