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

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.

2023年9月14日 · First, determine the measured QT interval (QT) in milliseconds. Next, determine the RR interval (RR) in seconds. Next, raise the RR interval to the power of 1/3. Finally, divide the QT interval by the result obtained in step 3 to calculate the corrected QT interval (QTcF).

This QTc calculator estimates the corrected QT interval expressed in seconds or milliseconds and based on patient’s heart rate in beats per minute.

2024年10月3日 · The QT interval is crucial for understanding the electrical activity of the heart, and an abnormally prolonged QT interval can signal a risk of arrhythmias, which may lead to sudden cardiac events. The QTcF calculation is based on Fridericia's formula, which adjusts the QT interval for heart rate using a cube root relationship. Historical ...

2024年10月3日 · QTcF计算基于Fridericia公式，该公式利用三次方根关系调整心率对QT间期的影响。 QT间期表示心脏心室在一次心跳过程中去极化和复极化所需的时间。 虽然较长的QT间期可能是心脏病的征兆，但它也受心率的影响。 为了标准化不同心率下的QT测量值，开发了Fridericia公式（QTcF）和Bazett公式（QTcB）等校正公式。 Fridericia公式发表于1920年，因其在心动过缓或心动过速情况下能进行更准确的调整而在临床心脏病学中备受青睐。 Fridericia校正QT间期 …

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.

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.

QTcF 公式可校正心率变化，为评估心律失常和其他心脏问题的风险提供标准化测量方法。 使用 HTML 和 JavaScript 创建 QTcF 计算器可以快速方便地进行计算，帮助医疗保健专业人员和研究人员开展工作，确保心脏健康。

2024年4月3日 · 在心脏病学领域，QTcF 计算器成为评估心脏复极和识别面临危及生命的心律失常风险的个人的重要工具。 通过了解其重要性、功能并解决常见问题，医疗保健专业人员可以利用 QTcF 计算器来加强患者护理并改善临床结果。