QTc Interval Calculator
Calculate the corrected QT interval (QTc) using Bazett and Fridericia formulas to assess risk of cardiac arrhythmias.
How to Use
- Enter the measured QT interval in milliseconds.
- Enter the patient's heart rate in bpm.
- Click Calculate to see QTc values and interpretation.
Casi d'Uso
- •Screening for drug-induced QT prolongation.
- •Pre-operative cardiac risk assessment.
- •Monitoring patients on antiarrhythmic medications.
Formula
Bazett: QTc = QT / √RR. Fridericia: QTc = QT / RR^(1/3). RR (s) = 60 / Heart Rate.
Domande Frequenti
What is a normal QTc interval?
A QTc below 440 ms is considered normal. Values between 440–460 ms are borderline, and above 460 ms indicate prolongation.
Why correct the QT interval?
The QT interval varies with heart rate. Correction formulas normalize it to a heart rate of 60 bpm for meaningful comparison.
Disclaimer
For educational purposes only. Does not replace professional medical evaluation.