ECG
QTc — corrected QT interval
Corrects the QT interval for heart rate with four formulas, adjusts for wide QRS (Bogossian modified QT and JT index), and grades the result against sex-specific limits for prolonged and short QT, including the ESC 2022 diagnostic thresholds for long and short QT syndromes and the torsades risk thresholds used for drug monitoring.
Upload a report, lab sheet or echo picture to fill this calculator automatically.
Sex
QTc limits are sex-specific
QT interval and rate
Correction formula
Auto uses Bazett at 60–90 bpm and Fridericia outside that range
Drug monitoring (optional)
QTc · Bazett
Enter the QT interval and heart rate (or RR interval).
References
- Rautaharju PM, et al. AHA/ACCF/HRS recommendations for the standardization and interpretation of the electrocardiogram: Part IV — the ST segment, T and U waves, and the QT interval. Circulation 2009;119:e241-e250.
- Zeppenfeld K, et al. 2022 ESC Guidelines for the management of patients with ventricular arrhythmias and the prevention of sudden cardiac death. Eur Heart J 2022;43:3997-4126.
- Drew BJ, et al. Prevention of torsade de pointes in hospital settings: a scientific statement from the AHA and ACCF. Circulation 2010;121:1047-1060.
- Bogossian H, et al. New formula for evaluation of the QT interval in patients with left bundle branch block. Heart Rhythm 2014;11:2273-2277.