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

Background: QT interval measured in the electrocardiogram (ECG) varies with RR interval challenging the calculation of corrected QT (QTc) in Atrial fibrillation (AF). Objectives: To identify the ideal Lead, number of complexes and the formula to measure QTc that correlates best between AF and sinus rhythm (SR).

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.

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.

2022年4月1日 · QTc corrected by the Bazett formula (before AF vs AF −38.7 ± 52.3 ms; after AF vs AF −42.6 ± 46.9 ms) yielded significant heterogeneity among the 3 time points. In conclusion, AF does not influence QTc. The Framingham formula accurately corrects QT without being affected by the AF episode.

Atrial fibrillation (AF) is associated with elevated HR and beat-to-beat variation. To find best correlation between QTc in atrial fibrillation (AF) versus restored sinus rhytm (SR) after electrical cardioversion (ECV) (primary end point) and to determine which correction formula and method are the best to determine QTc in AF (secondary end point).

2021年2月1日 · Background: QT interval measured in the electrocardiogram (ECG) varies with RR interval challenging the calculation of corrected QT (QTc) in Atrial fibrillation (AF). Objectives: To identify the ideal Lead, number of complexes and the formula to measure QTc that correlates best between AF and sinus rhythm (SR).

2024年11月8日 · Introduction: Corrected QT interval (QTc) is a ventricular repolarization marker on electrocardiography. Previous studies evaluated its value in predicting atrial fibrillation (AF) occurrence. However, its predictive efficacy for AF recurrence remains controversial.

To determine whether the QT interval, a marker of ventricular repolarization, could be used to predict incident AF. We examined a prolonged QT corrected by the Framingham formula (QT Fram) as a predictor of incident AF in the Atherosclerosis Risk in Communities (ARIC) study.

Recent studies have examined its value in predicting the occurrence of atrial fibrillation (AF). Methods and results: We conducted a meta-analysis to determine whether alterations in QTc interval are associated with an increased risk of incident AF. The PUBMED and EMBASE databases were searched for all studies that evaluated the incident AF ...