Corrected QT Interval Using RR Interval
The QT interval is a measure of the time between the start of the Q wave and the end of the T wave in the heart's electrical cycle. It can be corrected for heart rate for improved detection of patients at increased risk of ventricular arrhythmia.
The corrected QT interval equals the QT interval divided by the square root of the RR interval.
Formula
![QuantityVariable["QTc", "Time"] == QuantityVariable["QT", "Time"]/Sqrt[Quantity[1, "Seconds"^(-1)]*QuantityVariable["RR", "Time"]]](https://www.wolframcloud.com/objects/resourcesystem/marketplacestorage/resources/870/870704d7-edfc-4d46-a8c7-5ac144e73a38/Webpage/FormulaImage.png "Copy to Clipboard")
| symbol | description | physical quantity |
|---|---|---|
| QTc | corrected QT interval | "Time" |
| QT | QT interval | "Time" |
| RR | RR interval | "Time" |
Forms
Examples
Get the resource:
| In[1]:= | ![ResourceObject["Corrected QT Interval Using RR Interval"]](images/870/870704d7-edfc-4d46-a8c7-5ac144e73a38-io-1-i.en.gif){kind=small} |
| Out[1]= |  |
Get the formula:
| In[2]:= | ![FormulaData[ResourceObject["Corrected QT Interval Using RR Interval"]]](images/870/870704d7-edfc-4d46-a8c7-5ac144e73a38-io-2-i.en.gif){kind=small} |
| Out[2]= |  |
Use some values:
| In[3]:= | ![FormulaData[
ResourceObject[
"Corrected QT Interval Using RR Interval"], {QuantityVariable[
"RR","Time"] -> Quantity[0.86`2., "Seconds"]}]](images/870/870704d7-edfc-4d46-a8c7-5ac144e73a38-io-3-i.en.gif){kind=small} |
| Out[3]= |  |