Long QT syndrome: Difference between revisions

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#REDIRECT[[QT prolongation]]
#REDIRECT[[QT prolongation]]
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<div style="font-weight:bold;">📊 QTc (Corrected QT Interval) Calculator [show]</div>
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Revision as of 13:41, 21 March 2026

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📊 QTc (Corrected QT Interval) Calculator [show]

Corrected QT Interval (QTc)

Corrected QT Interval (QTc)
Parameter Value
QT Interval (ms)
Heart Rate (bpm)
RR Interval (ms) — auto-calculated from HR ms
Results
QTc (Bazett's) — QT / √(RR in sec) ms
QTc (Fridericia) — QT / ∛(RR in sec) ms
Interpretation (Bazett's QTc)
<440 ms Normal QTc for males.
<460 ms Normal QTc for females.
440–500 ms Borderline/Prolonged — Monitor closely. Review medications for QT-prolonging drugs.
>500 ms Significantly prolonged — High risk for Torsades de Pointes. Discontinue offending agents. Check Mg²⁺/K⁺/Ca²⁺.
References
  • Bazett HC. An analysis of the time-relations of electrocardiograms. Heart. 1920;7:353-370.
  • Fridericia LS. Duration of systole in electrocardiogram. Acta Med Scand. 1920;53:469-486.
  • Viskin S. Long QT syndromes and torsade de pointes. Lancet. 1999;354:1625-1633. PMID 10560690.