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QTc (Bazett)

Bazett Correction Standard • Accurate at HR 60-100 bpm

ms

Measure from start of Q wave to end of T wave.

bpm

Standard heart rate from ECG or pulse.

Ready for calculation

Enter QT and Heart Rate to view arrhythmia risk.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Clinical Applications

Identification of drug-induced QT prolongation (e.g., Macrolides, Antipsychotics).
Screening for Congenital Long QT Syndrome (LQTS).
Pre-operative ECG clearance for patients on high-risk medications.
Monitoring electrolyte disturbances (Hypokalemia, Hypomagnesemia, Hypocalcemia).

Why Correction Matters

The absolute QT interval varies inversely with heart rate. A raw QT of 400ms might be normal at 60 bpm but dangerously prolonged at 100 bpm. Correction (QTc) allows for a standardized assessment across different heart rates.

Last Comprehensive Review: 2026

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