The formula to calculate the corrected QT interval (QTcF) is:
\[ QTcF = \frac{QT}{(RR)^{1/3}} \]
Where:
QTcF, also known as Corrected QT Interval, is a measure used in electrocardiography (ECG) to assess the time it takes for the heart to electrically discharge and then recharge, which represents one heartbeat. The QT interval varies depending on the heart rate, so it is often corrected (QTcF) to provide a more accurate measure. This is important in diagnosing and monitoring certain heart conditions, such as Long QT Syndrome, and in assessing the potential cardiac effects of certain medications.
Let's assume the following values:
Using the formula:
\[ QTcF = \frac{400}{(1)^{1/3}} = 400 \text{ milliseconds} \]
The Corrected QT Interval (QTcF) is 400 milliseconds.