QT Corrected
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Measured QT (sec)
R-R Interval (sec)
R e s u l t s
QTc (sec)
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QT Corrected

Formula:

Measured QT (sec) / sqrt(R-R Interval) = QTc

Normal:

  • QTc should not exceed:
    • 0.45 in infants < 6mo
    • 0.44 in children
    • 0.425 in adolescents & adults

Long QT interval is indicative of ventricular arrhythmias like torsades de pointes and a risk factor for sudden death.

References:

Baltazar RF. Basic and Bedside Electrocardiography . Lippincott Williams & Wilkins, a Wolters Kluwer 2009