Corrected QT Interval (QTc)
QT Interval (ms)
RR Interval (ms)
QTc normalises the QT interval for heart rate. Prolonged QTc (>450ms men, >470ms women) signals risk of torsades de pointes, a potentially fatal arrhythmia.
- 1Bazett: QTc = QT / √RR (RR in seconds)
- 2Fridericia: QTc = QT / RR^(1/3) — more accurate
- 3RR (sec) = 60 / HR (bpm)
- 4Critical: QTc > 500ms requires urgent review
QT = 380ms, HR = 60 bpm (RR = 1.0s)=QTc (Bazett) = 380ms — Normal
| QTc | Men | Women |
|---|---|---|
| Normal | < 440ms | < 450ms |
| Borderline | 440–470ms | 450–480ms |
| Prolonged | > 470ms | > 480ms |
| Critical | > 500ms | > 500ms |
References
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