The formula to calculate the corrected QT interval (QTc) using the Fridericia method is:
\[ \text{QTc} = \frac{\text{QT}}{(\text{RR interval})^{1/3}} \]
Where:
The Fridericia QTc is a formula used to correct the QT interval for heart rate variability. The QT interval is the time from the start of the Q wave to the end of the T wave in the heart's electrical cycle. A prolonged QT interval can be a risk factor for ventricular arrhythmias. The Fridericia correction is one of several methods used to adjust the QT interval for heart rate, providing a more accurate assessment of the heart's electrical stability.
Let's assume the following:
Step 1: Calculate the RR interval:
\[ \text{RR interval} = \frac{60}{70} \approx 0.857 \text{ seconds} \]
Step 2: Calculate the corrected QT interval (QTc):
\[ \text{QTc} = \frac{400}{(0.857)^{1/3}} \approx 425.63 \text{ milliseconds} \]
Therefore, the corrected QT interval (QTc) is approximately 425.63 milliseconds.
