QT Corrected Interval

Calculator QT Corrected (Bazett Formula) Interval


What Is The QT Interval?

The QT Interval is one of the many measurements made on the electrocardiogram to measure the electrical conditions/properties of the heart. As the name suggests, measurement starts from the Q wave and ends at the T wave. This measurement is also related to the time when the cardiac ventricles contract to when they eventually relax.

QT Intervals can be abnormally short or long, when this happens, it leads to the development of various cardiovascular diseases, abnormal heart rhythms, or even sudden death (Due to cardiac arrest).

How Are These QT Abnormalities Formed?

QT Abnormalities like the ones we mentioned are formed because of genetic disorders. A really good example of that is the long QT syndrome. Some other reasons for these abnormalities could be hormonal imbalances.

How To Use QT Corrected Interval Calculator?

Using the QT Corrected Interval Calculator is easy, just follow the steps mentioned below.

Step 1: Enter QT Measured

In the first step, we have to enter the length of the QT interval. For this, we need to find the beginning of the Q wave and then localize it at the end of the T wave. Make sure to calculate this distance on the x-axis, using a caliper or a ruler is recommended.

The length of the QT interval will be in millimeters, we need to change it to milliseconds. Just type in the result that you get in the section mentioned.

Step 2: Enter The Required Parameter (Use Heart Rate)

In the last step, all you need to do is add the heart rate of the patient.

What Will Be The Results?

After entering all the required information, you will be given a corrected QT interval. A QT interval after correction for males is 430 ms and for females, it is 450 ms. QT Prolongation can be diagnosed if the measurement is more than 450 ms for males and 470 ms for females.

Bazett’s Formula For QT Interval :

QTc = QTm / √(RR)
RR = 60 / HR

  • QTc = Corrected QT
  • QTm = QT Measured
  • RR = RR Interval
  • HR = Heart Rate



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