Bazett's formula is often given in a form that returns QTc in dimensionally suspect units, square root of seconds. The dimensionally correct form of Bazett's formula is: where QTc B is the QT interval corrected for heart rate, and RR is the interval from the onset of one QRS complex to the onset of the next QRS complex.

Corrected QT Interval (QTc) Corrects the QT interval for heart rate extremes (choose from Bazett, Fridericia, Framingham, Hodges, or Rautaharju formulas). When to Use

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.

2025年1月18日 · Equations for correction of QT intervall.

What is a QTc? Because we have the need to create a number that is normal, a mathematical formula, known as Bazet's formula, was devised to correct for the heart rate of the patient.

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

检查电解质、药物史、甲状腺功能. 通过系统分析QT/QTc间期，结合临床背景，可显著降低恶性心律失常风险，优化患者管理。 一、QT/QTc正常范围 - 男性：QTc ≤0.45秒 - 女性：QTc ≤0.46秒 - QT间期延长：QTc间期超过上述数值 - 短QT综合征：QTc ≤0.32秒（需结合基因检测及临床评估） --- 二、QTc延长的临床意义 1. 获得性原因 - 药物（…

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.

QT interval defines the time from the onset of the QRS complex to the end of the T-wave and expresses the duration of depolarization and repolarization of the ventricular myocardium. It varies according to age, sex, and heart rate.

The QT interval is an electrocardiogram measurement to assess some of the characteristics of the electricity of the heart. It is measured as the time from the beginning of the Q wave to the end of the T-wave and close to the time from when the chamber of the heart begins to contract after completing relaxation.