Template:QTc Calculator: Difference between revisions
(Create QTc calculator template (Bazett and Fridericia)) |
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[[Category:Calculator templates]] | [[Category:Calculator templates]] | ||
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=== Corrected QT Interval (QTc) === | |||
<div class="calculator-container" data-calculator-refresh-on-load="true"> | <div class="calculator-container" data-calculator-refresh-on-load="true"> | ||
{| class="wikitable" style="width:100%; border-collapse:collapse;" | {| class="wikitable" style="width:100%; border-collapse:collapse;" | ||
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| '''QTc (Bazett's)''' — QT / √(RR in sec) | | '''QTc (Bazett's)''' — QT / √(RR in sec) | ||
| style="font-size:18px; font-weight:bold;" | {{calculator|id=qt_bazett|type=plain|formula=qt_qt/ | | style="font-size:18px; font-weight:bold;" | {{calculator|id=qt_bazett|type=plain|formula=qt_qt/sqrt(60/qt_hr)|decimals=0|NaN-text=—|style=min-width:4ch;display:inline-block}} ms | ||
|- | |- | ||
| '''QTc (Fridericia)''' — QT / ∛(RR in sec) | | '''QTc (Fridericia)''' — QT / ∛(RR in sec) | ||
| style="font-size:18px; font-weight:bold;" | {{calculator|id=qt_frid|type=plain|formula=qt_qt/ | | style="font-size:18px; font-weight:bold;" | {{calculator|id=qt_frid|type=plain|formula=qt_qt/cbrt(60/qt_hr)|decimals=0|NaN-text=—|style=min-width:4ch;display:inline-block}} ms | ||
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| style="background:#e74c3c; color:white; text-align:center; font-weight:bold;" | >500 ms | | style="background:#e74c3c; color:white; text-align:center; font-weight:bold;" | >500 ms | ||
| '''Significantly prolonged''' — High risk for '''Torsades de Pointes'''. Discontinue offending agents. Check Mg²⁺/K⁺/Ca²⁺. | | '''Significantly prolonged''' — High risk for '''[[Torsades de pointes|Torsades de Pointes]]'''. Discontinue offending agents. Check Mg²⁺/K⁺/Ca²⁺. | ||
|} | |||
{| class="wikitable" style="width:100%; margin-top:4px; font-size:90%;" | |||
! References | |||
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| | |||
* 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. | |||
|} | |} | ||
</div> | </div> | ||
Latest revision as of 16:49, 21 March 2026
Interactive Corrected QT Interval (QTc) calculator using Bazett's formula. Requires the calculator gadget.
Usage: {{QTc Calculator}}
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 |
|---|
|