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Calculations must be re-checked, shouldn't be used alone for patient care, and don't substitute for professional judgment. See our full disclaimer.
Corrects the QT interval for heart rate extremes.
Corrected QT (QTC) = Bazett's Formula = QT Interval / √ (RR interval)
RR Interval = 60/HR
Normal QTc ≤ 440 msec. A longer QTc puts the patient at increased risk for torsade de pointes.
Some causes of prolonged QT:
Calculations must be re-checked and should not be used alone to guide patient care nor should they substitute for clinical judgement. disclaimer