2024年10月8日 · Corrected QT interval (QTc) The corrected QT interval (QTc) estimates the QT interval at a standard heart rate of 60 bpm; This allows comparison of QT values over time at different heart rates and improves detection of patients at increased risk of arrhythmias; There are multiple formulas used to estimate QTc.

The Corrected QT Interval (QTc) adjusts the QT interval correctly for heart rate extremes.

This is a handy health tool that can estimate the QT corrected interval by using the heart rate expressed in beats per minute and QT interval expressed either in seconds or milliseconds. The QT values can be obtained from the ECG test.

Transform the length of the QT interval from millimeters or boxes to milliseconds. With a paper speed of 25 mm/s, one small box (1 mm) lasts 0.04 s, and one big box (5 mm) – 0.2 s. Type the result in the QT interval field of our QTc calculator. In the heart rate section, type the number of beats per minute of your patient’s heart rate.

2025年3月17日 · Quickly calculate the corrected QT interval by just entering the QT interval duration and the heart rate.

2025年1月18日 · One of the earliest and most widely used correction methods, Bazett’s formula calculates QTc by dividing the QT interval by the square root of the RR interval (the time between two successive R-wave peaks). However, it tends to overcorrect at high heart rates and undercorrect at low heart rates, potentially leading to inaccuracies.

The QTc calculator is based on heart rate (pulse rate) in beats per minute and QT interval, either in seconds or miliseconds. Heart rate is defined as the number of subsequent contractions of the heart during one minute, in which blood is pumped from the ventricles to the arteries.

To calculate the QTc, enter the heart rate in beats per minute, and the QT interval in either milliseconds or small boxes (40 ms). Enter multiple QT values, separated by spaces, to use the mean. The resulting QTc values are sorted smallest to largest. QTc > 500 increases the risk of torsades de pointes or worse.

You can use this QTc calculator to determine the corrected QT interval (QTc) in seconds in accordance with someone's heart rate (beats per minute). The QTc calculator relies on the formulas that are most commonly used to determine a QTc interval

Calculate the corrected QT Interval using our free online QTC Calculator. QT interval is a measure of the time taken for the heart muscle to depolarize and then repolarize, representing electrical systole. It is a significant parameter in electrocardiography (ECG) studies.