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  2. QT interval - Wikipedia

    en.wikipedia.org/wiki/QT_interval

    An "abnormal" QTc in males is a QTc above 450 ms; and, in females, above 470 ms. [17] If there is not a very high or low heart rate, the upper limits of QT can roughly be estimated by taking QT = QTc at a heart rate of 60 beats per minute (bpm), and subtracting 0.02 s from QT for every 10 bpm increase in heart rate.

  3. MDCalc - Wikipedia

    en.wikipedia.org/wiki/MDCalc

    MDCalc is a free online medical reference for healthcare professionals that provides point-of-care clinical decision-support tools, including medical calculators, scoring systems, and algorithms. [1]

  4. Long QT syndrome - Wikipedia

    en.wikipedia.org/wiki/Long_QT_syndrome

    Genotype and QTc interval duration are the strongest predictors of outcome for patients with LQTS. [ 17 ] [ 18 ] 2022 European Society of Cardiology clinical practice guidelines [ 44 ] have endorsed the use of independently validated risk score calculator, called 1-2-3-LQTS-Risk Calculator, [ 45 ] which allows to calculate individual 5-year ...

  5. Drug-induced QT prolongation - Wikipedia

    en.wikipedia.org/wiki/Drug-induced_QT_prolongation

    The value for a normal QT interval is similar in males and females from birth up to adolescence. During infancy, a normal QTc is defined as 400 ± 20 milliseconds. Before puberty, the 99th percentile of QTc values is 460 milliseconds. After puberty, this value increases to 470 milliseconds in males and 480 milliseconds in females. [citation needed]

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  7. Jervell and Lange-Nielsen syndrome - Wikipedia

    en.wikipedia.org/wiki/Jervell_and_Lange-Nielsen...

    The cardiac features of JLNS can be diagnosed by measuring the QT interval corrected for heart rate (QTc) on a 12-lead electrocardiogram (ECG). The QTc is less than 450 ms in 95% of normal males, and less than 460 ms in 95% of normal females. In those with Jervell and Lange-Nielsen syndrome the QTc is typically greater than 500 ms. [8]

  8. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    Corrected QT interval (QTc) The QT interval is measured from the beginning of the QRS complex to the end of the T wave. Acceptable ranges vary with heart rate, so it must be corrected to the QTc by dividing by the square root of the RR interval. A prolonged QTc interval is a risk factor for ventricular tachyarrhythmias and sudden death.

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