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How to measure the QT interval. The QT interval is usually measured in either lead II or V5-6, however the lead with the longest measurement should be used; Several successive beats should be measured, with the maximum interval taken; Large U waves (> 1mm) that are fused to the T wave should be included in the measurement
Corrects the QT interval for heart rate extremes (choose from Bazett, Fridericia, Framingham, Hodges, or Rautaharju formulas).
This online evidence based resource will help guide you how to measure the QT interval and calculate the QTc value with an easy to use calculator which takes into account the patients underlying rhythm, gender and age.
The QT interval is measured from the beginning of the QRS complex to the end of the T wave. It represents the duration of ventricular electrical systole (ventricular depolarisation and repolarisation). The QT interval includes the QRS interval, the ST-segment and the T wave.
The formula is as follows: Bazett’s formula for calculating corrected QT duration (QTc). QT correction according to Bazzet, Fridericia, Framingham and Hodges follow in the calculator below. QTc interval. QT interval (milliseconds) * Heart rate (beats per minute) * QTc interval according to Bazzetms. QTc = QT interval / √ (RR interval)
Adjust the QT interval according the to heart rate using the Bazett, Fridericia or Framingham method. The Bazett formula is the most commonly used, and is validated for heart rates between 60-100bpm. In the presence of tachycardia or bradycardia, one of the other two formulae should be used.
With our QTc calculator, you will be able to perform a correction of QT interval for your patient’s heart rate. In the text below, you will learn how to calculate QTc using Bazett’s formula and other equations (e.g., Fridericia, Framingham).
The most commonly used QT correction formula is the Bazett's formula, [5] named after physiologist Henry Cuthbert Bazett (1885–1950), [6] calculating the heart rate-corrected QT interval (QTcB). Bazett's formula is based on observations from a study in 1920.
Quickly calculate the corrected QT interval by just entering the QT interval duration and the heart rate.
Learn the Heart - Healio provides an in-depth tutorial on QT interval interpretation for ECG analysis.