Measured QT (sec) | |
R-R Interval (sec) |
Formula:
Measured QT (sec) / sqrt(R-R Interval) = QTc
Normal:
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