2024年10月8日 · 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. It is not clear which formula is the most useful:

Learn about QT time (duration), corrected QT (QTc) duration, with emphasis on ECG features and risk of arrhythmia (e.g LQTS).

The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart. It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.

1999年11月16日 · The QT Database is now on-line, with over 100 fifteen-minute two-lead ECG recordings (many excerpted from other databases), with onset, peak, and end markers for P, QRS, T, and (where present) U waves of from 30 to 50 selected beats in each recording.

2023年12月23日 · Normal QTc for males 0.36 – 0.44s. Normal QTc for females 0.36 – 0.46s. The heart rate has a direct impact on the QT interval. When the heart is lower the QT interval is longer and when the heart rate is higher the QT interval is shorter. In order to correct, this corrected QT interval (QTc) is calculated by using a formula.

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 length of the QT interval correlates strongly with the risk of potentially life-threatening ventricular arrhythmias. Therefore, the QT interval must always be assessed when interpreting the ECG. Long QT syndrome (LQTS) is manifest when a …

In general, the normal QT interval is below 400 to 440 milliseconds (ms), or 0.4 to 0.44 seconds. Women have a longer QT interval than men. Lower heart rates also result in a longer QT interval....

It is characterised by prolonged QT interval on ECG, which predisposes to malignant ventricular tachyarrhythmia, TdP, ventricular fibrillation and sudden death. The presentation can be variable, from asymptomatic to symptoms of syncope, seizures and palpitations to sudden death.

QCustomPlot是针对QT设计的一个自定义图表库，它允许开发者以高度自定义的方式绘制2D图形，包括曲线、散点图、直方图等，并且支持交互式操作，如缩放、平移、鼠标悬停显示数据点信息等。