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On modern ECG machines, the QTc is given. However, the machines are not always capable of making the correct determination of the end of the T wave. Therefore, it is important to check the QT time manually. | On modern ECG machines, the QTc is given. However, the machines are not always capable of making the correct determination of the end of the T wave. Therefore, it is important to check the QT time manually. | ||
Alternatives to the Bazzett correction formula are the Fridericia, Framingham and Hodges formulas. The latter two perform better at high heart rates (>100 /min). <cite>Indik</cite> | Alternatives to the Bazzett correction formula are the Fridericia, Framingham and Hodges formulas. The latter two perform better at high heart rates (>100 /min). <cite>Indik</cite><cite>T</cite> Fridericia: QTc = QT{HR/60}1/3, Framingham: QTc = QT + 0.154{1 – (60/HR)}, Hodges: QTc = QT + 1.75 (heart rate - 60). | ||
[[Image:Surawicz.jpg|120px|thumb|right|Dr Surawicz, founder of the tangent method, still active in November 2006, at age 89.]] | [[Image:Surawicz.jpg|120px|thumb|right|Dr Surawicz, founder of the tangent method, still active in November 2006, at age 89.]] | ||
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#Viskin pmid=15922261 | #Viskin pmid=15922261 | ||
#Indik pmid=16945790 | #Indik pmid=16945790 | ||
#T pmid=15842424 | |||
</biblio> | </biblio> | ||
}} | }} | ||
[[Category:ECG Course]] | [[Category:ECG Course]] | ||